3行日記 - 書くとAIが返事をくれる三行日記
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Three lines of diary entries each day, with a one-line response from three forest animals. An easy-to-use three-line diary app.
- Price
- Free
- No in-app purchases
- Updated
- Nov 4
- 2026 · v1.0.0
Screenshots
About 3行日記 - 書くとAIが返事をくれる三行日記
This is a diary app where you write just three lines about your day, and one of the three forest animals will give you a short reply.
Even those who couldn't keep a long diary can write just three lines.
"What happened today," "What was good/bad," "How I feel now." Just one line for each, whatever comes to mind is fine.
■ Write, and you'll receive a reply
When you save, someone will read your diary and leave a 2-3 sentence reply.
Replies will make you want to write again tomorrow.
■ The three forest animals that reply
・Howawa… A little white ball of fluff that gently comforts you on tough and difficult days
・Piiko… A chick that rejoices with you on happy and accomplished days
・Konoha… A little fox with a backpack that calmly accepts even ordinary days
The animal that replies will be determined by the content of your diary.
■ How to Continue Your 3-Line Diary
- Choose your mood for the day with 5 mood stamps.
- Review the calendar to see how your feelings changed on the day you wrote.
- The three characters may remember what you wrote before.
■ For Peace of Mind
- Replies are written by AI. For diaries with very distressing content, the administrators may review them before sending a reply.
- Diaries are sent to the server for reply writing and disappear after the reply is received. The diary itself remains only on your smartphone.
- No account registration is required. You can transfer your entries to a new device by exporting and importing.
- Replies arrive in a few minutes. This may be delayed depending on the content and server load.
- If you have concerns about a reply, you can report it by long-pressing.
- For more details, please see the Privacy Policy (https://udoh.jp/commentnikki-privacy/).
Free to use. Ads will appear at the bottom of the screen and in the diary list.
Even those who couldn't keep a long diary can write just three lines.
"What happened today," "What was good/bad," "How I feel now." Just one line for each, whatever comes to mind is fine.
■ Write, and you'll receive a reply
When you save, someone will read your diary and leave a 2-3 sentence reply.
Replies will make you want to write again tomorrow.
■ The three forest animals that reply
・Howawa… A little white ball of fluff that gently comforts you on tough and difficult days
・Piiko… A chick that rejoices with you on happy and accomplished days
・Konoha… A little fox with a backpack that calmly accepts even ordinary days
The animal that replies will be determined by the content of your diary.
■ How to Continue Your 3-Line Diary
- Choose your mood for the day with 5 mood stamps.
- Review the calendar to see how your feelings changed on the day you wrote.
- The three characters may remember what you wrote before.
■ For Peace of Mind
- Replies are written by AI. For diaries with very distressing content, the administrators may review them before sending a reply.
- Diaries are sent to the server for reply writing and disappear after the reply is received. The diary itself remains only on your smartphone.
- No account registration is required. You can transfer your entries to a new device by exporting and importing.
- Replies arrive in a few minutes. This may be delayed depending on the content and server load.
- If you have concerns about a reply, you can report it by long-pressing.
- For more details, please see the Privacy Policy (https://udoh.jp/commentnikki-privacy/).
Free to use. Ads will appear at the bottom of the screen and in the diary list.
What’s new
Version 1.0.0 · Updated November 4, 2026
初めてのリリースです。
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