diff --git a/src/Game.Client/Assets/Programs/Editor/Tests/PlayMode/InputSystemServiceRebindPlayModeTests.cs b/src/Game.Client/Assets/Programs/Editor/Tests/PlayMode/InputSystemServiceRebindPlayModeTests.cs
index 14dad5b80..fdaca8531 100644
--- a/src/Game.Client/Assets/Programs/Editor/Tests/PlayMode/InputSystemServiceRebindPlayModeTests.cs
+++ b/src/Game.Client/Assets/Programs/Editor/Tests/PlayMode/InputSystemServiceRebindPlayModeTests.cs
@@ -24,7 +24,7 @@ public override void Setup()
             base.Setup();
             _keyboard = InputSystem.AddDevice<Keyboard>();
             _gamepad = InputSystem.AddDevice<Gamepad>();
-            _service = new InputSystemService();
+            _service = new InputSystemService(new LocalizationService());
         }
 
         public override void TearDown()
@@ -56,7 +56,7 @@ public IEnumerator SaveLoadBindingOverrides_RoundTrip_RestoresOverride()
             Assert.That(json, Is.Not.Null.And.Not.Empty);
 
             // 別インスタンスへロードして再現
-            var service2 = new InputSystemService();
+            var service2 = new InputSystemService(new LocalizationService());
             service2.Startup();
             yield return null;
             service2.LoadBindingOverrides(json);
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/Abstractions/IInputSystemService.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/Abstractions/IInputSystemService.cs
index 19c3c34be..3d3b2f084 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/Abstractions/IInputSystemService.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/Abstractions/IInputSystemService.cs
@@ -28,8 +28,19 @@ public interface IInputSystemService : IGameService
         /// </summary>
         InputActionAsset InputActionAsset { get; }
 
+        /// <summary>
+        /// 操作スキーマ変更イベント
+        /// </summary>
         Observable<string> OnControlSchemeChanged { get; }
 
+        /// <summary>
+        /// 操作デバイス切替イベント
+        /// </summary>
+        Observable<(InputDevice device, InputDeviceChange deviceChange)> OnDeviceChanged { get; }
+
+        /// <summary>
+        /// キーバインド変更イベント
+        /// </summary>
         Observable<InputAction> OnBindingChanged { get; }
 
         /// <summary>
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/InputSystemService.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/InputSystemService.cs
index 3454437fa..049a207ea 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/InputSystemService.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/InputSystemService.cs
@@ -4,37 +4,45 @@
 using Game.Shared.Bootstrap;
 using Game.Shared.Constants;
 using Game.Shared.Input;
-using Game.Shared.Localization;
+using Game.Shared.Services.Interfaces;
 using R3;
 using UnityEngine;
 using UnityEngine.EventSystems;
 using UnityEngine.InputSystem;
+using UnityEngine.UI;
 
 namespace Game.Core.Services
 {
     public class InputSystemService : IInputSystemService, IDisposable
     {
+        private readonly ILocalizationService _localizationService;
+
         private ProjectDefaultInputSystem _inputSystem;
         private bool _isInitialized;
+        private string _controlScheme = InputControlSchemes.DefaultControlScheme;
+        private GameObject _selectedGameObject;
 
         public ProjectDefaultInputSystem.PlayerActions Player => _inputSystem.Player;
         public ProjectDefaultInputSystem.UIActions UI => _inputSystem.UI;
-
         public InputActionAsset InputActionAsset => _inputSystem?.asset;
 
-        private string _controlScheme = InputControlSchemes.DefaultControlScheme;
-        private GameObject _selectedGameObject;
-
         private readonly Subject<string> _onControlSchemeChanged = new();
         public Observable<string> OnControlSchemeChanged => _onControlSchemeChanged;
 
+        public Observable<(InputDevice device, InputDeviceChange deviceChange)> OnDeviceChanged
+            => Observable.FromEvent<Action<InputDevice, InputDeviceChange>, (InputDevice, InputDeviceChange)>(
+                h => (a, b) => h((a, b)),
+                h => InputSystem.onDeviceChange += h,
+                h => InputSystem.onDeviceChange -= h);
+
         private readonly Subject<InputAction> _onBindingChanged = new();
         public Observable<InputAction> OnBindingChanged => _onBindingChanged;
 
         #region Setup
 
-        public InputSystemService()
+        public InputSystemService(ILocalizationService localizationService)
         {
+            _localizationService = localizationService;
         }
 
         public void Startup()
@@ -112,9 +120,9 @@ public IDisposable BlockInputActions(params InputAction[] actions)
 
         #endregion
 
-        public void ResolveSelectable(GameObject selectedGameObject = null)
+        private void ResolveSelectable(GameObject selectedGameObject = null)
         {
-            var allSelectables = InputSystemHelper.GetAllSelectables();
+            var allSelectables = GetAllSelectables();
             if (allSelectables.Length > 0)
             {
                 GameObject go = null;
@@ -149,6 +157,22 @@ public void ResolveSelectable(GameObject selectedGameObject = null)
             Debug.Log("[InputService] No Selectables found");
         }
 
+        private static Selectable[] GetAllSelectables()
+        {
+            Selectable[] allSelectables = Array.Empty<Selectable>();
+            int allCount = Selectable.allSelectableCount;
+            if (allCount > 0)
+                allSelectables = new Selectable[allCount];
+            else
+                return allSelectables;
+
+            int count = Selectable.AllSelectablesNoAlloc(allSelectables);
+            if (count > 0) return allSelectables;
+
+            allSelectables = Selectable.allSelectablesArray;
+            return allSelectables;
+        }
+
         public GameObject GetSelectedGameObject()
         {
             return EventSystem.current.currentSelectedGameObject;
@@ -218,7 +242,7 @@ public string GetBindingDisplayString(string scheme, string actionName, string p
             {
                 // 既定の英語表示・デバイスレイアウト・controlPath を取得し、family 別ローカライズ名へ変換（未登録は英語へフォールバック）
                 var raw = action.GetBindingDisplayString(index, out var deviceLayoutName, out var controlPath);
-                parts.Add(InputControlsLocalizer.Localize(deviceLayoutName, controlPath, raw));
+                parts.Add(_localizationService.GetStringByInputControls(deviceLayoutName, controlPath, raw));
             }
             return string.Join("/", parts);
         }
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/LocalizationService.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/LocalizationService.cs
new file mode 100644
index 000000000..c63a8791d
--- /dev/null
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/LocalizationService.cs
@@ -0,0 +1,8 @@
+using Game.Shared.Services;
+
+namespace Game.Core.Services
+{
+    public class LocalizationService : LocalizationServiceBase, IGameService
+    {
+    }
+}
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/LocalizationService.cs.meta b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/LocalizationService.cs.meta
new file mode 100644
index 000000000..8ca57695a
--- /dev/null
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/Services/LocalizationService.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 57a1a758931e43a2a525ea10fc7d399b
+timeCreated: 1783839611
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindView.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindingView.cs
similarity index 98%
rename from src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindView.cs
rename to src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindingView.cs
index 33a2ace57..158eeea8e 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindView.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindingView.cs
@@ -10,7 +10,7 @@ namespace Game.Core.UI
     /// 現在のバインド表示と「変更」ボタンを持ち、押下を Observable で通知する。
     /// リバインド実行・重複判定などの入力ロジックは持たず、表示更新のみを担う。
     /// </summary>
-    public class InputActionRebindView : MonoBehaviour
+    public class InputActionRebindingView : MonoBehaviour
     {
         [Header("Identity")]
         [SerializeField] private string _scheme;            // コントロールスキーム（Keyboard&Mouse / Gamepad）
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindView.cs.meta b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindingView.cs.meta
similarity index 100%
rename from src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindView.cs.meta
rename to src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/InputActionRebindingView.cs.meta
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/SliderIndexSelector.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/SliderIndexSelector.cs
index 65d31ecfb..dc869926a 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/SliderIndexSelector.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Core/UI/SliderIndexSelector.cs
@@ -18,7 +18,7 @@ public class SliderIndexSelector : MonoBehaviour
         private bool _initialized;
 
         private readonly Subject<int> _onValueChanged = new();
-        public Observable<int> OnValueChanged => _onValueChanged.AsObservable();
+        public Observable<int> OnValueChanged => _onValueChanged;
 
         /// <summary>選択中の index。</summary>
         public int Index => Mathf.RoundToInt(_slider.value);
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorOptionDialog.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorOptionDialog.cs
index 30ea79e40..1b0e18613 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorOptionDialog.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorOptionDialog.cs
@@ -2,15 +2,13 @@
 using Cysharp.Threading.Tasks;
 using Game.Core.Services;
 using Game.Horror.SaveData;
-using Game.Horror.Services;
 using Game.Horror.Services.Interfaces;
 using Game.MVC.Core.Enums;
 using Game.MVC.Core.Scenes;
 using Game.Shared.Constants;
 using Game.Shared.Extensions;
-using Game.Shared.Input;
-using Game.Shared.Localization;
 using Game.Shared.Services;
+using Game.Shared.Services.Interfaces;
 using R3;
 using UnityEngine;
 
@@ -22,6 +20,7 @@ public class HorrorOptionDialog : GameDialogScene<HorrorOptionDialog, HorrorOpti
 
         private IInputSystemService _inputService;
         private IAudioService _audioService;
+        private ILocalizationService _localizationService;
 
         private IHorrorOptionSaveRepository _optionSaveRepository;
         private IHorrorOptionService _optionService;
@@ -43,6 +42,7 @@ public override UniTask PreInitialize()
         {
             _inputService = GameServiceManager.Resolve<IInputSystemService>();
             _audioService = GameServiceManager.Resolve<IAudioService>();
+            _localizationService = GameServiceManager.Resolve<ILocalizationService>();
             _optionSaveRepository = GameServiceManager.Resolve<IHorrorOptionSaveRepository>();
             _optionService = GameServiceManager.Resolve<IHorrorOptionService>();
             return base.PreInitialize();
@@ -240,10 +240,10 @@ public override UniTask Startup()
                 .AddTo(Disposables);
 
             // ロケール変更でバインド表示名を再ローカライズ
-            LocalizationEvents.OnLocaleChanged.Subscribe(_ => RefreshBindingDisplays()).AddTo(Disposables);
+            _localizationService.OnLocaleChanged.Subscribe(_ => RefreshBindingDisplays()).AddTo(Disposables);
 
             // コントローラー接続/切替に追従して family 別表示を更新する
-            InputSystemEvents.OnDeviceChanged.Subscribe(_ => RefreshBindingDisplays()).AddTo(Disposables);
+            _inputService.OnDeviceChanged.Subscribe(_ => RefreshBindingDisplays()).AddTo(Disposables);
 
             return base.Startup();
         }
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorOptionDialogComponent.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorOptionDialogComponent.cs
index a57aed9c0..6d7195398 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorOptionDialogComponent.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorOptionDialogComponent.cs
@@ -33,7 +33,7 @@ public class HorrorOptionDialogComponent : GameSceneComponent
         [SerializeField] private SliderBooleanSelector _crouchMode;
 
         [Header("Options - Control")]
-        [SerializeField] private InputActionRebindView[] _rebindViews;
+        [SerializeField] private InputActionRebindingView[] _rebindViews;
         [SerializeField] private Button _resetKeyboardBindingsButton;
         [SerializeField] private Button _resetGamepadBindingsButton;
 
@@ -85,7 +85,7 @@ public class HorrorOptionDialogComponent : GameSceneComponent
         #region Controls
 
         /// <summary>キーリバインド行（アクション×スキーム単位）。Dialog 側が購読・表示更新する。</summary>
-        public IReadOnlyList<InputActionRebindView> RebindViews => _rebindViews;
+        public IReadOnlyList<InputActionRebindingView> RebindViews => _rebindViews;
 
         /// <summary>スキーム別リセットボタン押下。値は対象スキーム（KBM / Gamepad）。</summary>
         public Observable<string> OnResetSchemeBindingsRequested => Observable.Merge(
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorSaveDataDialogComponent.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorSaveDataDialogComponent.cs
index 1ab1217fd..27cd681c2 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorSaveDataDialogComponent.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Dialogs/HorrorSaveDataDialogComponent.cs
@@ -3,8 +3,8 @@
 using Game.Core.Services;
 using Game.Horror.SaveData;
 using Game.MVC.Core.Scenes;
-using Game.Shared.Localization;
 using Game.Shared.Services;
+using Game.Shared.Services.Interfaces;
 using R3;
 using UnityEngine;
 
@@ -27,6 +27,7 @@ public Observable<int> OnSlotSelected
         public void SetSlotInfos(IReadOnlyList<HorrorSaveSlotInfo> slots)
         {
             var database = GameServiceManager.Resolve<IScriptableDatabaseService>().Database;
+            var localization = GameServiceManager.Resolve<ILocalizationService>();
 
             foreach (var slot in slots)
             {
@@ -42,7 +43,7 @@ public void SetSlotInfos(IReadOnlyList<HorrorSaveSlotInfo> slots)
                 if (slot.HasData)
                 {
                     if (database.HorrorInteractionMasterTable.TryFindById(slot.SavepointId, out var master))
-                        savepointName = InteractionsLocalizer.Localize(master.InteractionLocalizeKey);
+                        savepointName = localization.GetStringByInteractions(master.InteractionLocalizeKey);
                     else
                         Debug.LogError($"[{GetType().Name}] HorrorInteractionMaster not found: SavepointId={slot.SavepointId}");
 
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/HorrorGameLauncher.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/HorrorGameLauncher.cs
index be8bbda6d..58e54288c 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/HorrorGameLauncher.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/HorrorGameLauncher.cs
@@ -9,6 +9,7 @@
 using Game.Shared.Enums;
 using Game.Shared.SaveData;
 using Game.Shared.Services;
+using Game.Shared.Services.Interfaces;
 
 namespace Game.Horror
 {
@@ -27,6 +28,8 @@ public async UniTask StartupAsync()
             // 各種サービス取得・初期化
             var assetService = new AddressableAssetService();
             GameServiceManager.Register<IAddressableAssetService, AddressableAssetService>(assetService);
+            var localizationService = new LocalizationService();
+            GameServiceManager.Register<ILocalizationService, LocalizationService>(localizationService);
 
             var dbService = new ScriptableDatabaseService(assetService);
             GameServiceManager.Register<IScriptableDatabaseService, ScriptableDatabaseService>(dbService);
@@ -58,7 +61,7 @@ public async UniTask StartupAsync()
             HorrorOptionHelper.ApplySaveData(optionSaveRepository.Data);
 
             // キーリバインドのオーバーライドを起動時に適用
-            var inputSystemService = new InputSystemService();
+            var inputSystemService = new InputSystemService(localizationService);
             GameServiceManager.Register<IInputSystemService, InputSystemService>(inputSystemService);
             inputSystemService.LoadBindingOverrides(optionSaveRepository.Data.InputBindingOverridesJson);
 
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Interaction/InteractableBase.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Interaction/InteractableBase.cs
index 27e6756b1..93c60218e 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Interaction/InteractableBase.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Interaction/InteractableBase.cs
@@ -7,6 +7,7 @@
 using Game.Shared.Scriptable.Database;
 using Game.Shared.Scriptable.Database.Tables;
 using Game.Shared.Services;
+using Game.Shared.Services.Interfaces;
 using UnityEngine;
 
 namespace Game.Horror.Interaction
@@ -36,6 +37,7 @@ public abstract class InteractableBase : MonoBehaviour, IInteractable
         protected IHorrorInteractionService InteractionService { get; private set; }
         protected IHorrorInventoryService InventoryService { get; private set; }
 
+        private ILocalizationService _localizationService;
         private IScriptableDatabaseService _databaseService;
         protected ScriptableDatabase Database => _databaseService.Database;
 
@@ -54,6 +56,7 @@ protected virtual void Start()
             InteractionService = GameServiceManager.Resolve<IHorrorInteractionService>();
             InventoryService = GameServiceManager.Resolve<IHorrorInventoryService>();
 
+            _localizationService = GameServiceManager.Resolve<ILocalizationService>();
             _databaseService = GameServiceManager.Resolve<IScriptableDatabaseService>();
             if (_databaseService.Database.HorrorInteractionMasterTable.TryFindById(_interactionId, out var master))
             {
@@ -132,7 +135,7 @@ public UniTask<bool> TryShowRejectionMessage()
             if (Master == null || string.IsNullOrEmpty(Master.RejectionMessageLocalizeKey))
                 return UniTask.FromResult(false);
 
-            var message = InteractionMessagesLocalizer.Localize(Master.RejectionMessageLocalizeKey);
+            var message = _localizationService.GetStringByInteractionMessages(Master.RejectionMessageLocalizeKey);
             return HorrorMessageDialog.RunAsync(message);
         }
 
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Interaction/InteractionPromptView.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Interaction/InteractionPromptView.cs
index 5be15b65d..7e3aba339 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Interaction/InteractionPromptView.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Interaction/InteractionPromptView.cs
@@ -1,8 +1,7 @@
 using Game.Core.Services;
 using Game.Shared.Enums;
-using Game.Shared.Input;
-using Game.Shared.Localization;
 using Game.Shared.Scriptable.Database.Tables;
+using Game.Shared.Services.Interfaces;
 using R3;
 using TMPro;
 using UnityEngine;
@@ -44,6 +43,7 @@ public class InteractionPromptView : MonoBehaviour
 
         private HorrorInteractionMaster _master;
         private IInputSystemService _inputService;
+        private ILocalizationService _localizationService;
 
         private Camera _viewCamera;
         private bool _interactionToggle;
@@ -52,15 +52,17 @@ public void Initialize(HorrorInteractionMaster master)
         {
             _master = master;
             _inputService = GameServiceManager.Resolve<IInputSystemService>();
+            _localizationService = GameServiceManager.Resolve<ILocalizationService>();
 
-            LocalizationEvents.OnLocaleChanged.Subscribe(_ => SetInteractionText()).AddTo(this);
+            _localizationService.OnLocaleChanged.Subscribe(_ => SetInteractionText()).AddTo(this);
             SetInteractionText();
 
             _inputService.OnControlSchemeChanged.Subscribe(_ => SetInputBindingText()).AddTo(this);
+            _inputService.OnDeviceChanged.Subscribe(_ => SetInputBindingText()).AddTo(this);
             _inputService.OnBindingChanged
                 .Where(x => x == _inputService.Player.Interact)
-                .Subscribe(_ => SetInputBindingText()).AddTo(this);
-            InputSystemEvents.OnDeviceChanged.Subscribe(_ => SetInputBindingText()).AddTo(this);
+                .Subscribe(_ => SetInputBindingText())
+                .AddTo(this);
             SetInputBindingText();
 
             _inputTypeRoot.SetActive(master.InputType == InteractionInputType.Hold);
@@ -71,8 +73,8 @@ public void Initialize(HorrorInteractionMaster master)
         private void SetInteractionText()
         {
             _interactionText.text = !_interactionToggle
-                ? ContextActionsLocalizer.Localize(_master.InteractionVerbLocalizeKey)
-                : ContextActionsLocalizer.Localize(_master.ReinteractionVerbLocalizeKey);
+                ? _localizationService.GetStringByContextActions(_master.InteractionVerbLocalizeKey)
+                : _localizationService.GetStringByContextActions(_master.ReinteractionVerbLocalizeKey);
         }
 
         private void SetInputBindingText()
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Inventory/HorrorInventoryContextActionView.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Inventory/HorrorInventoryContextActionView.cs
index 88ec05195..e26ef07b1 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Inventory/HorrorInventoryContextActionView.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/Horror/Inventory/HorrorInventoryContextActionView.cs
@@ -1,5 +1,7 @@
+using Game.Core.Services;
 using Game.Shared.Enums;
 using Game.Shared.Localization;
+using Game.Shared.Services.Interfaces;
 using R3;
 using TMPro;
 using UnityEngine;
@@ -24,7 +26,10 @@ public class HorrorInventoryContextActionView : MonoBehaviour
         public void Initialize(InventoryContextActionType contextAction)
         {
             if (_label != null)
-                _label.text = ContextActionsLocalizer.Localize(contextAction.ToString());
+            {
+                var localization = GameServiceManager.Resolve<ILocalizationService>();
+                _label.text = localization.GetStringByContextActions(contextAction.ToString());
+            }
 
             _button.OnClickAsObservable()
                 .Subscribe(_ => _onClicked.OnNext(contextAction))
diff --git a/src/Game.Client/Assets/Programs/Runtime/MVC/ScoreTimeAttack/ScoreTimeAttackGameLauncher.cs b/src/Game.Client/Assets/Programs/Runtime/MVC/ScoreTimeAttack/ScoreTimeAttackGameLauncher.cs
index 041c139e3..d09f41a43 100644
--- a/src/Game.Client/Assets/Programs/Runtime/MVC/ScoreTimeAttack/ScoreTimeAttackGameLauncher.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/MVC/ScoreTimeAttack/ScoreTimeAttackGameLauncher.cs
@@ -8,6 +8,7 @@
 using Game.Shared.Enums;
 using Game.Shared.SaveData;
 using Game.Shared.Services;
+using Game.Shared.Services.Interfaces;
 
 namespace Game.ScoreTimeAttack
 {
@@ -26,6 +27,8 @@ public async UniTask StartupAsync()
             // 2. 各種サービス取得・初期化
             var assetService = new AddressableAssetService();
             GameServiceManager.Register<IAddressableAssetService, AddressableAssetService>(assetService);
+            var localizationService = new LocalizationService();
+            GameServiceManager.Register<ILocalizationService, LocalizationService>(localizationService);
 
             var masterDataService = new MasterDataService(assetService);
             await masterDataService.LoadMasterDataAsync();
@@ -35,7 +38,7 @@ public async UniTask StartupAsync()
             await audioService.LoadAsync();
             GameServiceManager.Register<IAudioService, AudioService>(audioService);
             GameServiceManager.Register<IMessagePipeService, MessagePipeService>(new MessagePipeService());
-            var inputSystemService = new InputSystemService();
+            var inputSystemService = new InputSystemService(localizationService);
             GameServiceManager.Register<IInputSystemService, InputSystemService>(inputSystemService);
 
             // 3. 共通オブジェクト読み込み
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Constants/LocalizationConstants.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Constants/LocalizationConstants.cs
index 1bc934ac9..b554360b1 100644
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Constants/LocalizationConstants.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/Shared/Constants/LocalizationConstants.cs
@@ -6,5 +6,6 @@ public static class LocalizationConstants
         public const string ContextActionsTable = "ContextActions";
         public const string InteractionMessagesTable = "InteractionMessages";
         public const string InteractionsTable = "Interactions";
+        public const string UITextsTable = "UITexts";
     }
 }
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Input/InputSystemHelper.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Input/InputSystemHelper.cs
deleted file mode 100644
index f5d8e867b..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Input/InputSystemHelper.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-using System;
-using UnityEngine.UI;
-
-namespace Game.Shared.Input
-{
-    public static class InputSystemHelper
-    {
-        public static Selectable[] GetAllSelectables()
-        {
-            Selectable[] allSelectables = Array.Empty<Selectable>();
-            int allCount = Selectable.allSelectableCount;
-            if (allCount > 0)
-                allSelectables = new Selectable[allCount];
-            else
-                return allSelectables;
-
-            int count = Selectable.AllSelectablesNoAlloc(allSelectables);
-            if (count > 0) return allSelectables;
-
-            allSelectables = Selectable.allSelectablesArray;
-            return allSelectables;
-        }
-    }
-}
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Input/InputSystemHelper.cs.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Input/InputSystemHelper.cs.meta
deleted file mode 100644
index 47ae8a4fe..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Input/InputSystemHelper.cs.meta
+++ /dev/null
@@ -1,3 +0,0 @@
-fileFormatVersion: 2
-guid: 4318b2bacdb74eb7bf9b383889c56a89
-timeCreated: 1779548363
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/ContextActionsLocalizer.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/ContextActionsLocalizer.cs
deleted file mode 100644
index b95ce0eb3..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/ContextActionsLocalizer.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using Game.Shared.Constants;
-
-namespace Game.Shared.Localization
-{
-    public static class ContextActionsLocalizer
-    {
-        public static string Localize(string localizeKey)
-            => LocalizationHelper.GetLocalizedString(LocalizationConstants.ContextActionsTable , localizeKey);
-    }
-}
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/ContextActionsLocalizer.cs.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/ContextActionsLocalizer.cs.meta
deleted file mode 100644
index e040f0718..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/ContextActionsLocalizer.cs.meta
+++ /dev/null
@@ -1,3 +0,0 @@
-fileFormatVersion: 2
-guid: 067b77b998b44b3f9b947e728dfe2288
-timeCreated: 1782405768
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InputControlsLocalizer.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InputControlsLocalizer.cs
deleted file mode 100644
index 5f725117d..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InputControlsLocalizer.cs
+++ /dev/null
@@ -1,45 +0,0 @@
-using Game.Shared.Constants;
-using UnityEngine.InputSystem;
-
-namespace Game.Shared.Localization
-{
-    /// <summary>
-    /// 入力コントロールの表示名をローカライズする。
-    /// controlPath（"space", "buttonSouth", "dpad/up" 等、デバイス接頭辞なし）をキーに
-    /// StringTable "InputControls" を引き、未登録キーは Unity 既定の英語表示へフォールバックする。
-    /// ゲームパッドは接続デバイスの family（xbox/ps/switch）でプレフィックス付きキーを優先的に引く。
-    /// </summary>
-    public static class InputControlsLocalizer
-    {
-        /// <summary>
-        /// controlPath をキーに InputControls からローカライズ名を引く。
-        /// family プレフィックス付きキー → 無印キー → fallback(raw) の順に解決する。
-        /// </summary>
-        /// <param name="deviceLayoutName">解決済みコントロールのデバイスレイアウト名（family 判定用。null/空可）。</param>
-        /// <param name="controlPath"></param>
-        /// <param name="fallback"></param>
-        public static string Localize(string deviceLayoutName, string controlPath, string fallback)
-        {
-            if (string.IsNullOrEmpty(controlPath)) return fallback;
-
-            var prefix = ResolveFamilyPrefix(deviceLayoutName);
-            if (prefix.Length > 0)
-            {
-                var localized = LocalizationHelper.GetLocalizedString(LocalizationConstants.InputControlsTable, prefix + controlPath);
-                if (!string.IsNullOrEmpty(localized)) return localized;
-            }
-
-            return LocalizationHelper.GetLocalizedString(LocalizationConstants.InputControlsTable, controlPath) ?? fallback;
-        }
-
-        /// <summary>デバイスレイアウトを family プレフィックスへ分類する（未知/未接続は空＝無印）。</summary>
-        private static string ResolveFamilyPrefix(string deviceLayoutName)
-        {
-            if (string.IsNullOrEmpty(deviceLayoutName)) return string.Empty;
-            if (InputSystem.IsFirstLayoutBasedOnSecond(deviceLayoutName, "DualShockGamepad")) return "ps/";
-            if (InputSystem.IsFirstLayoutBasedOnSecond(deviceLayoutName, "SwitchProControllerHID")) return "switch/";
-            if (InputSystem.IsFirstLayoutBasedOnSecond(deviceLayoutName, "XInputController")) return "xbox/";
-            return string.Empty;
-        }
-    }
-}
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InputControlsLocalizer.cs.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InputControlsLocalizer.cs.meta
deleted file mode 100644
index 8d65c65d9..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InputControlsLocalizer.cs.meta
+++ /dev/null
@@ -1,2 +0,0 @@
-fileFormatVersion: 2
-guid: d473c5fa06c90354db647a4416b6ef39
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionMessagesLocalizer.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionMessagesLocalizer.cs
deleted file mode 100644
index 298a94918..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionMessagesLocalizer.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using Game.Shared.Constants;
-
-namespace Game.Shared.Localization
-{
-    public static class InteractionMessagesLocalizer
-    {
-        public static string Localize(string localizeKey)
-            => LocalizationHelper.GetLocalizedString(LocalizationConstants.InteractionMessagesTable , localizeKey);
-    }
-}
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionMessagesLocalizer.cs.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionMessagesLocalizer.cs.meta
deleted file mode 100644
index c9499ba9d..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionMessagesLocalizer.cs.meta
+++ /dev/null
@@ -1,3 +0,0 @@
-fileFormatVersion: 2
-guid: 1f663bc4007c4bfb84d1aa4e02d93009
-timeCreated: 1782615025
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionsLocalizer.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionsLocalizer.cs
deleted file mode 100644
index 053ba98cd..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionsLocalizer.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using Game.Shared.Constants;
-
-namespace Game.Shared.Localization
-{
-    public static class InteractionsLocalizer
-    {
-        public static string Localize(string localizeKey)
-            => LocalizationHelper.GetLocalizedString(LocalizationConstants.InteractionsTable , localizeKey);
-    }
-}
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionsLocalizer.cs.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionsLocalizer.cs.meta
deleted file mode 100644
index bf20e2d49..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/InteractionsLocalizer.cs.meta
+++ /dev/null
@@ -1,2 +0,0 @@
-fileFormatVersion: 2
-guid: 5414b5e2773a7e947aca9c76bf831c2e
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizationHelper.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizationHelper.cs
deleted file mode 100644
index 845e42d9b..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizationHelper.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-using UnityEngine.Localization.Settings;
-
-namespace Game.Shared.Localization
-{
-    public static class LocalizationHelper
-    {
-        public static string GetLocalizedString(string tableName, string localizeKey)
-        {
-            var entry = LocalizationSettings.StringDatabase.GetTableEntry(tableName, localizeKey).Entry;
-            return entry != null ?　entry.GetLocalizedString() : null;
-        }
-    }
-}
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizationHelper.cs.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizationHelper.cs.meta
deleted file mode 100644
index 97d94febd..000000000
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizationHelper.cs.meta
+++ /dev/null
@@ -1,3 +0,0 @@
-fileFormatVersion: 2
-guid: 0b9d02fcbdf84f5386bf473f2af555e3
-timeCreated: 1782405235
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizeStrings.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizeStrings.cs
index 112db4647..ed33db59d 100644
--- a/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizeStrings.cs
+++ b/src/Game.Client/Assets/Programs/Runtime/Shared/Localization/LocalizeStrings.cs
@@ -12,7 +12,7 @@ public class LocalizeStrings : MonoBehaviour
         private string[] _strings;
 
         private readonly Subject<string[]> _onChangedLocale = new();
-        public Observable<string[]> OnChangedLocale => _onChangedLocale.AsObservable();
+        public Observable<string[]> OnChangedLocale => _onChangedLocale;
 
         private void Awake()
         {
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces.meta
new file mode 100644
index 000000000..f00649d57
--- /dev/null
+++ b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: dd82cac6cabc487cbb4d122a00721195
+timeCreated: 1783838320
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces/ILocalizationService.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces/ILocalizationService.cs
new file mode 100644
index 000000000..048b33b4b
--- /dev/null
+++ b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces/ILocalizationService.cs
@@ -0,0 +1,24 @@
+using R3;
+using UnityEngine.Localization;
+
+namespace Game.Shared.Services.Interfaces
+{
+    public interface ILocalizationService
+    {
+        Locale SelectedLocale { get; }
+
+        Observable<Locale> OnLocaleChanged { get; }
+
+        string GetLocalizedString(string tableName, string localizeKey);
+
+        string GetStringByContextActions(string localizeKey);
+
+        string GetStringByInputControls(string deviceLayoutName, string controlPath, string fallback);
+
+        string GetStringByInteractions(string localizeKey);
+
+        string GetStringByInteractionMessages(string localizeKey);
+
+        string GetStringByUITexts(string localizeKey);
+    }
+}
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces/ILocalizationService.cs.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces/ILocalizationService.cs.meta
new file mode 100644
index 000000000..426294826
--- /dev/null
+++ b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/Interfaces/ILocalizationService.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 04a73b56f27c4cbd858b32a6e2c74974
+timeCreated: 1783838329
\ No newline at end of file
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Services/LocalizationServiceBase.cs b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/LocalizationServiceBase.cs
new file mode 100644
index 000000000..23f40f424
--- /dev/null
+++ b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/LocalizationServiceBase.cs
@@ -0,0 +1,71 @@
+using System;
+using Game.Shared.Constants;
+using Game.Shared.Services.Interfaces;
+using R3;
+using UnityEngine.InputSystem;
+using UnityEngine.Localization;
+using UnityEngine.Localization.Settings;
+
+namespace Game.Shared.Services
+{
+    public abstract class LocalizationServiceBase : ILocalizationService
+    {
+        public Locale SelectedLocale => LocalizationSettings.SelectedLocale;
+
+        public Observable<Locale> OnLocaleChanged
+            => Observable.FromEvent<Action<Locale>, Locale>(
+                h => h,
+                h => LocalizationSettings.SelectedLocaleChanged += h,
+                h => LocalizationSettings.SelectedLocaleChanged -= h);
+
+        public string GetLocalizedString(string tableName, string localizeKey)
+        {
+            var entry = LocalizationSettings.StringDatabase.GetTableEntry(tableName, localizeKey).Entry;
+            return entry != null ?　entry.GetLocalizedString() : null;
+        }
+
+        public string GetStringByContextActions(string localizeKey)
+            => GetLocalizedString(LocalizationConstants.ContextActionsTable, localizeKey);
+
+        /// <summary>
+        /// controlPath をキーに InputControls からローカライズ名を引く。
+        /// family プレフィックス付きキー → 無印キー → fallback(raw) の順に解決する。
+        /// </summary>
+        /// <param name="deviceLayoutName">解決済みコントロールのデバイスレイアウト名（family 判定用。null/空可）。</param>
+        /// <param name="controlPath"></param>
+        /// <param name="fallback"></param>
+        public string GetStringByInputControls(string deviceLayoutName, string controlPath, string fallback)
+        {
+            if (string.IsNullOrEmpty(controlPath)) return fallback;
+
+            var prefix = ResolveFamilyPrefix(deviceLayoutName);
+            if (prefix.Length > 0)
+            {
+                var localized = GetLocalizedString(LocalizationConstants.InputControlsTable, prefix + controlPath);
+                if (!string.IsNullOrEmpty(localized)) return localized;
+            }
+
+            return GetLocalizedString(LocalizationConstants.InputControlsTable, controlPath) ?? fallback;
+        }
+
+        /// <summary>デバイスレイアウトを family プレフィックスへ分類する（未知/未接続は空＝無印）。</summary>
+        private static string ResolveFamilyPrefix(string deviceLayoutName)
+        {
+            if (string.IsNullOrEmpty(deviceLayoutName)) return string.Empty;
+            if (InputSystem.IsFirstLayoutBasedOnSecond(deviceLayoutName, "DualShockGamepad")) return "ps/";
+            if (InputSystem.IsFirstLayoutBasedOnSecond(deviceLayoutName, "SwitchProControllerHID")) return "switch/";
+            if (InputSystem.IsFirstLayoutBasedOnSecond(deviceLayoutName, "XInputController")) return "xbox/";
+            return string.Empty;
+        }
+
+        public string GetStringByInteractions(string localizeKey)
+            => GetLocalizedString(LocalizationConstants.InteractionsTable, localizeKey);
+
+        public string GetStringByInteractionMessages(string localizeKey)
+            => GetLocalizedString(LocalizationConstants.InteractionMessagesTable, localizeKey);
+
+        public string GetStringByUITexts(string localizeKey)
+            => GetLocalizedString(LocalizationConstants.UITextsTable, localizeKey);
+    }
+}
+
diff --git a/src/Game.Client/Assets/Programs/Runtime/Shared/Services/LocalizationServiceBase.cs.meta b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/LocalizationServiceBase.cs.meta
new file mode 100644
index 000000000..e31a4d53e
--- /dev/null
+++ b/src/Game.Client/Assets/Programs/Runtime/Shared/Services/LocalizationServiceBase.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 0b86c7e4748d4bd4a90130a77d5750a6
+timeCreated: 1783838628
\ No newline at end of file