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Use AI to polish an email, check keigo and draft replies

The AI button in the compose window turns notes (even in Chinese) or awkward Japanese into a polished Japanese business email, checks keigo, and drafts replies. The body only changes when you click Use this.

Updated 2026-10-102 min read

Applies to

Industries
Real Estate・Small Businesses
Plans
All plans
Feature
Sales
On this page
  1. What it does
  2. How to use it
  3. What a reply draft is based on
  4. When it does not work

What it does

Click AI under the subject in the compose window and choose one of three options:

  • Rewrite as a Japanese business email: turns notes (even in Chinese) or an awkward Japanese draft into a polite Japanese email, subject included.
  • Check keigo & wording: flags double honorifics, mixed-up honorific and humble forms, casual expressions and more, and gives you the corrected text.
  • Draft a reply: shown only when you reply to a customer (when the compose window was opened with Reply in a thread). It drafts from the customer's email and what you want to say.

The email to the customer is always written in Japanese. Reasons and notes are shown in your screen language.

How to use it

  1. Write the body. For a reply draft, open the compose window with Reply under the customer's email.
  2. Click AI and choose an option. For a reply draft, type the points under "What you want to say (notes in any language are fine)" and click Draft.
  3. After "AI is writing…", the result ("Rewritten email", "Keigo check" or "Reply draft") appears in the compose window. The keigo check lists each phrase before and after.
  4. Click Use this to put it in the body, or Discard.
  5. Even after using it, Undo next to "AI result applied" restores the previous text.
Note

The AI only changes your email when you click Use this. Always check names, dates and amounts before sending.

What a reply draft is based on

  • Only the emails in the thread whose body you can see (up to the latest 8). Emails hidden from you by the sharing setting are not used.
  • Anything the emails do not say (dates, amounts and so on) is marked 【要確認：…】 in the draft. Fill it in before sending.

When it does not work

  • "AI に渡す材料がありません" (nothing to work with): write the body first for rewriting and checking; use reply drafts when replying to a customer.
  • "本文が長すぎます（4000 字まで）" (too long): rewriting and checking handle up to 4,000 characters. Split it into paragraphs.
  • "AI ポイントが不足しています" (not enough AI points): AI features use AI points. Ask an admin to check the balance under Settings → Plan & usage.
  • AI is not shown when you send a quote or other document "Via Bookmi".
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