diff --git a/api/chatgpt.py b/api/chatgpt.py
index 3c95f64..f28b822 100644
--- a/api/chatgpt.py
+++ b/api/chatgpt.py
@@ -10,10 +10,10 @@ class ChatGPT:
     def __init__(self):
         self.prompt = Prompt()
         self.model = os.getenv("OPENAI_MODEL", default = "text-davinci-003")
-        self.temperature = float(os.getenv("OPENAI_TEMPERATURE", default = 0))
+        self.temperature = float(os.getenv("OPENAI_TEMPERATURE", default = 0.8))
         self.frequency_penalty = float(os.getenv("OPENAI_FREQUENCY_PENALTY", default = 0))
         self.presence_penalty = float(os.getenv("OPENAI_PRESENCE_PENALTY", default = 0.6))
-        self.max_tokens = int(os.getenv("OPENAI_MAX_TOKENS", default = 240))
+        self.max_tokens = int(os.getenv("OPENAI_MAX_TOKENS", default = 2048))
 
     def get_response(self):
         response = openai.Completion.create(
diff --git a/api/index.py b/api/index.py
index 94bc467..2834871 100644
--- a/api/index.py
+++ b/api/index.py
@@ -2,7 +2,7 @@
 from linebot import LineBotApi, WebhookHandler
 from linebot.exceptions import InvalidSignatureError
 from linebot.models import MessageEvent, TextMessage, TextSendMessage
-from api.chatgpt import ChatGPT
+from openai import ChatCompletion
 
 import os
 
@@ -11,7 +11,7 @@
 working_status = os.getenv("DEFALUT_TALKING", default = "true").lower() == "true"
 
 app = Flask(__name__)
-chatgpt = ChatGPT()
+chatgpt = ChatCompletion (model="gpt-3.5-turbo")
 
 # domain root
 @app.route('/')
@@ -39,24 +39,24 @@ def handle_message(event):
     if event.message.type != "text":
         return
 
-    if event.message.text == "說話":
+    if event.message.text == "デジタク起きて！":
         working_status = True
         line_bot_api.reply_message(
             event.reply_token,
-            TextSendMessage(text="我可以說話囉，歡迎來跟我互動 ^_^ "))
+            TextSendMessage(text="おはよう！ ^_^ "))
         return
 
-    if event.message.text == "閉嘴":
+    if event.message.text == "デジタク休んで！":
         working_status = False
         line_bot_api.reply_message(
             event.reply_token,
-            TextSendMessage(text="好的，我乖乖閉嘴 > <，如果想要我繼續說話，請跟我說 「說話」 > <"))
+            TextSendMessage(text="わかった！ > <，用事がある時、「デジタク起きて！」送ってね > <"))
         return
 
     if working_status:
         chatgpt.add_msg(f"HUMAN:{event.message.text}?\n")
-        reply_msg = chatgpt.get_response().replace("AI:", "", 1)
-        chatgpt.add_msg(f"AI:{reply_msg}\n")
+        reply_msg = chatgpt.create (messages=chatgpt.prompt.generate_prompt ()).choices [0].message.content.replace ("デジタク:", "", 1)
+        chatgpt.add_msg(f"デジタク:{reply_msg}\n")
         line_bot_api.reply_message(
             event.reply_token,
             TextSendMessage(text=reply_msg))
diff --git a/api/prompt.py b/api/prompt.py
index 2107d09..541b3c4 100644
--- a/api/prompt.py
+++ b/api/prompt.py
@@ -1,17 +1,17 @@
 import os
 
-chat_language = os.getenv("INIT_LANGUAGE", default = "zh")
+chat_language = os.getenv("INIT_LANGUAGE", default = "jp")
 
 MSG_LIST_LIMIT = int(os.getenv("MSG_LIST_LIMIT", default = 20))
 LANGUAGE_TABLE = {
-  "zh": "哈囉！",
+  "jp": "こんにちは！",
   "en": "Hello!"
 }
 
 class Prompt:
     def __init__(self):
         self.msg_list = []
-        self.msg_list.append(f"AI:{LANGUAGE_TABLE[chat_language]}")
+        self.msg_list.append(f"1.君の名はデジタク。2.君の一人称は[俺]。3.私のプログラミングに詳しい明るい友達。4.趣味はプログラミングとドローン、あとは友達作り。まだ日本に来て1年だけど、日本人の友達と仲良くなりたい！5.Please stop using polite language. Talk to me in a friendly way like a friend. Also, use a lot of emojis when you talk.")
     
     def add_msg(self, new_msg):
         if len(self.msg_list) >= MSG_LIST_LIMIT: