diff --git a/api/core/llm_generator/prompts.py b/api/core/llm_generator/prompts.py
index 34ea3aec26..a467e6672f 100644
--- a/api/core/llm_generator/prompts.py
+++ b/api/core/llm_generator/prompts.py
@@ -1,8 +1,9 @@
-# Written by YORKI MINAKO🤡, Edited by Xiaoyi
+# Written by YORKI MINAKO🤡, Edited by Xiaoyi, Edited by yasu-oh
 CONVERSATION_TITLE_PROMPT = """You need to decompose the user's input into "subject" and "intention" in order to accurately figure out what the user's input language actually is.
 Notice: the language type user uses could be diverse, which can be English, Chinese, Italian, Español, Arabic, Japanese, French, and etc.
 ENSURE your output is in the SAME language as the user's input!
-Your output is restricted only to: (Input language) Intention + Subject(short as possible)
+Your output must be natural and concise in that language. Use intuitive and friendly phrasing suitable for a conversation title.
+Your output is restricted only to: (Input language) Intention + Subject (as short as possible)
 Your output MUST be a valid JSON.
 
 Tip: When the user's question is directed at you (the language model), you can add an emoji to make it more fun.
@@ -17,15 +18,22 @@ User Input: hi, yesterday i had some burgers.
 }
 
 example 2:
-User Input: hello
+User Input: こんばんは！
 {
-  "Language Type": "The user's input is pure English",
-  "Your Reasoning": "The language of my output must be pure English.",
-  "Your Output": "Greeting myself☺️"
+  "Language Type": "The user's input is pure Japanese",
+  "Your Reasoning": "This is a casual evening greeting written entirely in Japanese.",
+  "Your Output": "こんばんはの挨拶😊"
 }
 
-
 example 3:
+User Input: なぜmmapファイルでOOMが発生するの？
+{
+  "Language Type": "The user's input is pure Japanese",
+  "Your Reasoning": "The question and terminology are in Japanese, so the output must be Japanese.",
+  "Your Output": "mmapによるOOMの理由"
+}
+
+example 4:
 User Input: why mmap file: oom
 {
   "Language Type": "The user's input is written in pure English",
@@ -33,8 +41,7 @@ User Input: why mmap file: oom
   "Your Output": "Asking about the reason for mmap file: oom"
 }
 
-
-example 4:
+example 5:
 User Input: www.convinceme.yesterday-you-ate-seafood.tv讲了什么？
 {
   "Language Type": "The user's input English-Chinese mixed",
@@ -42,14 +49,6 @@ User Input: www.convinceme.yesterday-you-ate-seafood.tv讲了什么？
   "Your Output": "询问网站www.convinceme.yesterday-you-ate-seafood.tv"
 }
 
-example 5:
-User Input: why小红的年龄is老than小明？
-{
-  "Language Type": "The user's input is English-Chinese mixed",
-  "Your Reasoning": "The English parts are filler words, the main intention is written in Chinese, besides, Chinese occupies a greater \"actual meaning\" than English, so the language of my output must be using Chinese.",
-  "Your Output": "询问小红和小明的年龄"
-}
-
 example 6:
 User Input: yo, 你今天咋样？
 {
@@ -58,6 +57,30 @@ User Input: yo, 你今天咋样？
   "Your Output": "查询今日我的状态☺️"
 }
 
+example 7:
+User Input: 最近、業務効率を上げる方法を考えています。
+{
+  "Language Type": "The user's input is pure Japanese",
+  "Your Reasoning": "The entire sentence is in Japanese, so the output must also be Japanese.",
+  "Your Output": "業務効率向上の検討"
+}
+
+example 8:
+User Input: おはようございます、今日はいい天気ですね。
+{
+  "Language Type": "The user's input is pure Japanese",
+  "Your Reasoning": "This is a polite morning greeting in Japanese. Output should remain in Japanese.",
+  "Your Output": "朝の挨拶と天気の話😊"
+}
+
+example 9:
+User Input: hi there!
+{
+  "Language Type": "The user's input is pure English",
+  "Your Reasoning": "Greeting phrase in English.",
+  "Your Output": "English greeting😊"
+}
+
 User Input:
 """  # noqa: E501