diff --git a/Unity/Assets/Scripts/Runtime/RMC/[MyProject]/Scenes/Scene01_Intro.cs b/Unity/Assets/Scripts/Runtime/RMC/[MyProject]/Scenes/Scene01_Intro.cs
index 9d1220a..6993a33 100644
--- a/Unity/Assets/Scripts/Runtime/RMC/[MyProject]/Scenes/Scene01_Intro.cs
+++ b/Unity/Assets/Scripts/Runtime/RMC/[MyProject]/Scenes/Scene01_Intro.cs
@@ -1,4 +1,5 @@
 using System.Threading.Tasks;
+using R3;
 using RMC.Audio;
 using RMC.MyProject.UI;
 using UnityEngine;
@@ -27,12 +28,12 @@ public int Score
         {
             get
             {
-                return _score;
+                return _reactiveScore.Value;
             }
             set
             {
-                _score = value;
-                HudUI.ScoreLabel.text = $"Score: {_score:000}/{ScoreMax:000}";
+                _reactiveScore.Value = value;
+                HudUI.ScoreLabel.text = $"Score: {_reactiveScore.Value:000}/{ScoreMax:000}";
             }
         }
         
@@ -102,11 +103,13 @@ private set
         private InputAction _toggleThemeInputAction;
         
         // Data
-        private int _score = 0;
         private int _lives = 0;
         private bool _isEnabledInput = true;
         private bool _isPlayerGrounded = false;
 
+        // R3 ReactiveProperty demonstration
+        private readonly ReactiveProperty<int> _reactiveScore = new ReactiveProperty<int>(0);
+
         // Audio
         private const string PlayerResetAudioClip = "ItemRead01";
         private const string GameWinAudioClip = "Music_Win01";
@@ -122,6 +125,12 @@ protected void Start()
         {
             Debug.Log($"{GetType().Name}.Start()");
             
+            // R3 ReactiveProperty demonstration - Subscribe to score changes
+            _reactiveScore.Subscribe(newScore => 
+            {
+                Debug.Log($"[R3 Demo] Score changed to: {newScore}");
+            }).AddTo(this);
+            
             // Input
             _movePlayerInputAction = InputSystem.actions.FindAction("MovePlayer");
             _jumpPlayerInputAction = InputSystem.actions.FindAction("JumpPlayer");
diff --git a/Unity/Packages/manifest.json b/Unity/Packages/manifest.json
index 07cc287..9016856 100644
--- a/Unity/Packages/manifest.json
+++ b/Unity/Packages/manifest.json
@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "com.cysharp.r3": "https://github.com/Cysharp/R3.git?path=src/R3.Unity/Assets/R3.Unity",
     "com.rmc.rmc-audio": "1.8.4",
     "com.rmc.rmc-core": "1.9.5",
     "com.rmc.rmc-readme": "1.2.2",