diff --git a/Unity/Assets/Scripts/Runtime/RMC.MyProject.Runtime.asmdef b/Unity/Assets/Scripts/Runtime/RMC.MyProject.Runtime.asmdef
index 216cfc5..a9c19cf 100644
--- a/Unity/Assets/Scripts/Runtime/RMC.MyProject.Runtime.asmdef
+++ b/Unity/Assets/Scripts/Runtime/RMC.MyProject.Runtime.asmdef
@@ -4,7 +4,8 @@
     "references": [
         "GUID:75469ad4d38634e559750d17036d5f7c",
         "GUID:8d0b5587a0a8ae741afbfe3a79c2872a",
-        "GUID:9f522e882e6bd48429f616f259fa6318"
+        "GUID:9f522e882e6bd48429f616f259fa6318",
+        "R3.Unity"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],
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..acb915b 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;
@@ -33,6 +34,9 @@ public int Score
             {
                 _score = value;
                 HudUI.ScoreLabel.text = $"Score: {_score:000}/{ScoreMax:000}";
+                
+                // R3 ReactiveProperty Demo: Update reactive score
+                _reactiveScore.Value = _score;
             }
         }
         
@@ -113,6 +117,9 @@ private set
         private const string PlayerJumpAudioClip = "ItemUpdate01";
         private const string PlayerMoveAudioClip = "Click01";
         
+        // R3 Reactive Property Demo
+        private ReactiveProperty<int> _reactiveScore = new ReactiveProperty<int>(0);
+        
         //  Unity Methods ---------------------------------
         
         /// <summary>
@@ -122,6 +129,12 @@ protected void Start()
         {
             Debug.Log($"{GetType().Name}.Start()");
             
+            // R3 ReactiveProperty Demo: Subscribe to reactive score changes
+            _reactiveScore.Subscribe(score => 
+            {
+                Debug.Log($"[R3 Demo] Reactive Score changed to: {score}");
+            });
+            
             // Input
             _movePlayerInputAction = InputSystem.actions.FindAction("MovePlayer");
             _jumpPlayerInputAction = InputSystem.actions.FindAction("JumpPlayer");
@@ -321,6 +334,15 @@ private void PlayAudioClip(string audioClipName)
         {
             AudioManager.Instance.PlayAudioClip(audioClipName);
         }
+        
+        /// <summary>
+        /// Clean up resources when the GameObject is destroyed
+        /// </summary>
+        protected void OnDestroy()
+        {
+            // R3 ReactiveProperty Demo: Dispose of reactive property
+            _reactiveScore?.Dispose();
+        }
 
         //  Event Handlers --------------------------------
 
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",