diff --git a/.gitignore b/.gitignore
index 58cbc82..a58b783 100644
--- a/.gitignore
+++ b/.gitignore
@@ -70,3 +70,7 @@ crashlytics-build.properties
 # Temporary auto-generated Android Assets
 /[Aa]ssets/[Ss]treamingAssets/aa.meta
 /[Aa]ssets/[Ss]treamingAssets/aa/*
+
+# Open AI API Key
+/[Aa]ssets/[Rr]esources/ApiKey.txt
+/[Aa]ssets/[Rr]esources/ApiKey.txt.meta
\ No newline at end of file
diff --git a/Assets/Resources.meta b/Assets/Resources.meta
new file mode 100644
index 0000000..b1af25e
--- /dev/null
+++ b/Assets/Resources.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 23df1d1da2f798f4ab0460ad4df0658e
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scenes/SampleScene.unity b/Assets/Scenes/SampleScene.unity
index 9421266..0856f94 100644
--- a/Assets/Scenes/SampleScene.unity
+++ b/Assets/Scenes/SampleScene.unity
@@ -202,7 +202,54 @@ Transform:
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
   m_LocalPosition: {x: 0, y: 0, z: -10}
   m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
   m_Children: []
   m_Father: {fileID: 0}
   m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!1 &764219436
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 764219438}
+  - component: {fileID: 764219437}
+  m_Layer: 0
+  m_Name: GameObject
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!114 &764219437
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 764219436}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 75c1c8d2f998caf46b7f794475bd2e1d, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  PlayerHP: 100
+  EnemyHP: 100
+--- !u!4 &764219438
+Transform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 764219436}
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
+  m_Father: {fileID: 0}
+  m_RootOrder: 1
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
diff --git a/Assets/Scripts/ChatGPTConnection.cs b/Assets/Scripts/ChatGPTConnection.cs
new file mode 100644
index 0000000..85993a5
--- /dev/null
+++ b/Assets/Scripts/ChatGPTConnection.cs
@@ -0,0 +1,37 @@
+using UnityEngine.Networking;
+using Newtonsoft.Json;
+
+namespace HackathonA
+{
+    public class ChatGPTConnection
+    {
+        private readonly JsonSerializerSettings settings = new();
+        private readonly string apiKey;
+        private readonly string apiUrl;
+
+
+        public ChatGPTConnection(string apiKey, string apiUrl)
+        {
+            this.apiKey = apiKey;
+            this.apiUrl = apiUrl;
+            settings.NullValueHandling = NullValueHandling.Ignore;
+        }
+
+        public RequestHandler CreateCompletionRequest(ChatGPTDatas.RequestData requestData)
+        {
+            var json = JsonConvert.SerializeObject(requestData, settings);
+
+            byte[] data = System.Text.Encoding.UTF8.GetBytes(json);
+
+            var request = new UnityWebRequest(apiUrl, "POST")
+            {
+                uploadHandler = new UploadHandlerRaw(data),
+                downloadHandler = new DownloadHandlerBuffer()
+            };
+            request.SetRequestHeader("Authorization", $"Bearer {this.apiKey}");
+            request.SetRequestHeader("Content-Type", "application/json");
+
+            return new RequestHandler(request);
+        }
+    }
+}
diff --git a/Assets/Scripts/ChatGPTConnection.cs.meta b/Assets/Scripts/ChatGPTConnection.cs.meta
new file mode 100644
index 0000000..6364754
--- /dev/null
+++ b/Assets/Scripts/ChatGPTConnection.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 23ca9e3a45225224d9328b7532ec5915
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/ChatGPTDatas.cs b/Assets/Scripts/ChatGPTDatas.cs
new file mode 100644
index 0000000..65828d3
--- /dev/null
+++ b/Assets/Scripts/ChatGPTDatas.cs
@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+
+namespace HackathonA.ChatGPTDatas
+{
+    [Serializable]
+    public class RequestData
+    {
+        public string model = "gpt-3.5-turbo";
+        public List<Message> messages;
+        public float? temperature = null; // [0.0 - 2.0]
+        public float? top_p = null;
+        public int? n = null;
+        public bool? stream = null;
+        public List<string> stop = null;
+        public int? max_tokens = null;
+        public float? presence_penalty = null;
+        public float? frequency_penalty = null;
+        public Dictionary<int, int> logit_bias = null;
+        public string user = null;
+    }
+
+    [Serializable]
+    public class Message
+    {
+        public string role;
+        public string content;
+    }
+
+    [Serializable]
+    public class Usage
+    {
+        public int prompt_tokens;
+        public int completion_tokens;
+        public int total_tokens;
+    }
+
+    [Serializable]
+    public class Choice
+    {
+        public Message message;
+        public string finish_reason;
+        public int index;
+    }
+
+    [Serializable]
+    public class ResponseData
+    {
+        public string id;
+        public string @object;
+        public int created;
+        public string model;
+        public Usage usage;
+        public List<Choice> choices;
+    }
+}
diff --git a/Assets/Scripts/ChatGPTDatas.cs.meta b/Assets/Scripts/ChatGPTDatas.cs.meta
new file mode 100644
index 0000000..4865249
--- /dev/null
+++ b/Assets/Scripts/ChatGPTDatas.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 587f7d94992790c4e9b6674dd2eb0390
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/DebugLoger.cs b/Assets/Scripts/DebugLoger.cs
new file mode 100644
index 0000000..da001c9
--- /dev/null
+++ b/Assets/Scripts/DebugLoger.cs
@@ -0,0 +1,22 @@
+using System;
+using System.Diagnostics;
+using Unity.VisualScripting;
+using UnityEngine;
+
+namespace HackathonA
+{
+    public class DebugLoger
+    {
+        [Conditional("UNITY_EDITOR"), Conditional("DEVELOPMENT_BUILD")]
+        public static void LogError(string error)
+        {
+            UnityEngine.Debug.LogError(error);
+        }
+
+        [Conditional("UNITY_EDITOR"), Conditional("DEVELOPMENT_BUILD")]
+        public static void Log(string error)
+        {
+            UnityEngine.Debug.Log(error);
+        }
+    }
+}
diff --git a/Assets/Scripts/DebugLoger.cs.meta b/Assets/Scripts/DebugLoger.cs.meta
new file mode 100644
index 0000000..ef2a83d
--- /dev/null
+++ b/Assets/Scripts/DebugLoger.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: e6160ddfcc82e00449d6a5431d424bc5
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/EnemyAI.cs b/Assets/Scripts/EnemyAI.cs
new file mode 100644
index 0000000..569f1fc
--- /dev/null
+++ b/Assets/Scripts/EnemyAI.cs
@@ -0,0 +1,108 @@
+using System.Collections.Generic;
+using Cysharp.Threading.Tasks;
+using HackathonA.ChatGPTDatas;
+
+namespace HackathonA
+{
+    public class EnemyAI
+    {
+        public int DefaultPhysicalAttack { get; set; } = 20;
+        public int DefaultMagicAttack { get; set; } = 20;
+        public int DefaultRecoveryPoint { get; set; } = 15;
+        public int DefaultActionOnError { get; set; } = 0;
+
+        private const string API_URL = "https://api.openai.com/v1/chat/completions";
+        private readonly string _apiKey;
+        private readonly ChatGPTConnection _chatGPTConnection;
+
+        // ChatGPTに入力するメッセージのリスト（過去の内容も一緒に渡すためリスト）
+        private List<Message> _messages;
+
+        public EnemyAI(string apiKey)
+        {
+            _apiKey = apiKey;
+            _messages = new List<Message>()
+            {
+                new Message(){role = "system", content = GenerateSystemMessage()},
+            };
+            _chatGPTConnection = new ChatGPTConnection(_apiKey, API_URL);
+        }
+
+        private string GenerateSystemMessage()
+        {
+            return GenerateSystemMessage(DefaultPhysicalAttack, DefaultMagicAttack, DefaultRecoveryPoint);
+        }
+
+        private string GenerateSystemMessage(int physicalAttack, int mamgicAttack, int recoveryPoint)
+        {
+            return @$"Please answer with an integer from 0-4 for your action
+
+You can take the following actions
+0: Physical attack. {physicalAttack} damage
+1: Magic attack. {mamgicAttack} damage
+2: Recovery. {recoveryPoint} recovery
+3: Physical Counter. bounce back if opponen's action is Physical attack
+4: Magic counter. bounce back if opponent's action is Magic attack
+
+Input example: Your HP is currently 1000 and your opponent's HP is 1000
+Output example: 0";
+        }
+
+        // 敵の設定
+        public void Set(int physicalAttack, int mamgicAttack, int recoveryPoint)
+        {
+            _messages = new List<Message>()
+            {
+                new Message(){role = "system", content = GenerateSystemMessage(physicalAttack, mamgicAttack, recoveryPoint)},
+            };
+        }
+
+        /// <summary>
+        /// ChatGPTとの通信を開始
+        /// </summary>
+        /// <param name="playerHP">プレイヤーのHP</param>
+        /// <param name="enemyHP">敵のHP</param>
+        /// <returns>アクションのタイプ(0-4)。エラー時にはDefaultActionOnErrorで設定した値が返ってくる</returns>
+        public async UniTask<int> GetEnemyActionAsync(int playerHP, int enemyHP)
+        {
+            string currentMessage = $"Currently, your HP is  {enemyHP} and your opponent's HP is {playerHP}.\nChoose from the options above and respond with the corresponding number.";
+            DebugLoger.Log(currentMessage);
+            _messages.Add(new Message() { role = "user", content = currentMessage });
+
+            using var request = _chatGPTConnection.CreateCompletionRequest(new RequestData() { messages = _messages });
+
+            await request.SendAsync();
+
+            // エラーがあった場合は、それをコンソールに出力
+            if (request.IsError)
+            {
+                DebugLoger.LogError(request.Error);
+                return DefaultActionOnError;
+            }
+            else
+            {
+                var responseMessage = request.Response.choices[0].message.content;
+                DebugLoger.Log($"ChatGPT replied '{responseMessage}'");
+
+                // 文字列を数値に変換
+                if (int.TryParse(responseMessage[..1], out var action)) 
+                {
+                    if (0 <= action && action <= 4)
+                    {
+                        return action;
+                    }
+                    else
+                    {
+                        return DefaultActionOnError;
+                    }
+                }
+                else
+                {
+
+                    DebugLoger.LogError($"Unable to parse '{responseMessage}'");
+                    return DefaultActionOnError;
+                }
+            }
+        }
+    }
+}
diff --git a/Assets/Scripts/EnemyAI.cs.meta b/Assets/Scripts/EnemyAI.cs.meta
new file mode 100644
index 0000000..bb998a4
--- /dev/null
+++ b/Assets/Scripts/EnemyAI.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 6692c24e8a5bcd5468c0165516de2d29
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/RequestHandler.cs b/Assets/Scripts/RequestHandler.cs
new file mode 100644
index 0000000..00f98bc
--- /dev/null
+++ b/Assets/Scripts/RequestHandler.cs
@@ -0,0 +1,44 @@
+using UnityEngine.Networking;
+using Newtonsoft.Json;
+using Cysharp.Threading.Tasks;
+using System;
+
+namespace HackathonA
+{
+    public class RequestHandler: IDisposable
+    {
+        public bool IsCompleted { get; private set; }
+        public bool IsError => Error != null;
+        public string Error { get; private set; }
+        public ChatGPTDatas.ResponseData Response { get; private set; }
+
+        private UnityWebRequest request;
+
+        public RequestHandler(UnityWebRequest request)
+        {
+            this.request = request;
+        }
+
+        public async UniTask SendAsync()
+        {
+            using (request)
+            {
+                await request.SendWebRequest();
+
+                if (request.result != UnityWebRequest.Result.Success)
+                {
+                    Error = "[ChatGPTConnection] " + request.error + "\n\n" + request.downloadHandler.text;
+                }
+                else
+                {
+                    Response = JsonConvert.DeserializeObject<ChatGPTDatas.ResponseData>(request.downloadHandler.text);
+                }
+            }
+        }
+
+        public void Dispose()
+        {
+            request?.Dispose();
+        }
+    }
+}
diff --git a/Assets/Scripts/RequestHandler.cs.meta b/Assets/Scripts/RequestHandler.cs.meta
new file mode 100644
index 0000000..efbf057
--- /dev/null
+++ b/Assets/Scripts/RequestHandler.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 27635be83f21f5341abfae620bd21531
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/SampleGameBehaviour.cs b/Assets/Scripts/SampleGameBehaviour.cs
new file mode 100644
index 0000000..f234139
--- /dev/null
+++ b/Assets/Scripts/SampleGameBehaviour.cs
@@ -0,0 +1,18 @@
+using UnityEngine;
+
+namespace HackathonA
+{
+    public class SampleGameBehaviour : MonoBehaviour
+    {
+        public int PlayerHP = 100;
+        public int EnemyHP = 100;
+
+        async void Start()
+        {
+            var config = Resources.Load("ApiKey") as TextAsset;
+            var _apiKey = config.text.Trim();
+            var enemyBehaviour = new EnemyAI(_apiKey);
+            DebugLoger.Log($"Enemy Action: {await enemyBehaviour.GetEnemyActionAsync(PlayerHP, EnemyHP)}");
+        }
+    }
+}
diff --git a/Assets/Scripts/SampleGameBehaviour.cs.meta b/Assets/Scripts/SampleGameBehaviour.cs.meta
new file mode 100644
index 0000000..e7e4a4a
--- /dev/null
+++ b/Assets/Scripts/SampleGameBehaviour.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 75c1c8d2f998caf46b7f794475bd2e1d
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Packages/manifest.json b/Packages/manifest.json
index 9256c20..6635ea5 100644
--- a/Packages/manifest.json
+++ b/Packages/manifest.json
@@ -1,10 +1,12 @@
 {
   "dependencies": {
+    "com.cysharp.unitask": "https://github.com/Cysharp/UniTask.git?path=src/UniTask/Assets/Plugins/UniTask",
     "com.unity.collab-proxy": "2.0.3",
     "com.unity.feature.2d": "1.0.0",
     "com.unity.ide.rider": "3.0.20",
     "com.unity.ide.visualstudio": "2.0.18",
     "com.unity.ide.vscode": "1.2.5",
+    "com.unity.nuget.newtonsoft-json": "3.2.1",
     "com.unity.test-framework": "1.1.31",
     "com.unity.textmeshpro": "3.0.6",
     "com.unity.timeline": "1.6.4",
diff --git a/Packages/packages-lock.json b/Packages/packages-lock.json
index ba7f5b2..0a26664 100644
--- a/Packages/packages-lock.json
+++ b/Packages/packages-lock.json
@@ -1,5 +1,12 @@
 {
   "dependencies": {
+    "com.cysharp.unitask": {
+      "version": "https://github.com/Cysharp/UniTask.git?path=src/UniTask/Assets/Plugins/UniTask",
+      "depth": 0,
+      "source": "git",
+      "dependencies": {},
+      "hash": "f2773f585e762480c835ac718b82b87cb111e500"
+    },
     "com.unity.2d.animation": {
       "version": "7.0.10",
       "depth": 1,
@@ -154,6 +161,13 @@
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
+    "com.unity.nuget.newtonsoft-json": {
+      "version": "3.2.1",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
     "com.unity.test-framework": {
       "version": "1.1.31",
       "depth": 0,