Privacy Policy

Aozora Eigo / Last updated: September 26, 2026

Aozora Eigo (the “App”) is an app for reading public-domain Japanese literature from Aozora Bunko with English words mixed into the text. This policy explains what information the App handles and why.

1. Information stored on your device

The following is stored only on your device. The developer cannot see or collect it.

• Reading positions and reading status
• Words and example sentences saved to your word book, quiz results and review stages
• Your bookshelves and the works placed on them
• Display settings (vertical/horizontal writing, typeface, text size, line height, colour theme)
• Book text files you have saved for offline reading

All of this is removed from your device when you uninstall the App.

2. Account sign-in and sync

If you sign in with a Google account or an Apple Account (“Sign in with Apple” on iOS), your reading positions, bookshelves, display settings, word book and quiz results are stored in the cloud so you can carry them over to your other devices. Signing in is optional; every reading feature works without it.

• Services used: Google Firebase Authentication for sign-in (Google Sign-In / Sign in with Apple) and Cloud Firestore (stored in the Tokyo region) for the data. See Firebase Privacy and Security for how Google handles it.
• What is stored: the identifier, display name and email address of the account you signed in with (for authentication; if you choose “Hide My Email” with Sign in with Apple, the relay address issued by Apple), plus reading positions, bookshelves, display settings, word book and quiz results. Security rules restrict access so that only you can read or write your own data.
• What is not synced: book text files saved for offline reading stay on that device only.
• Deletion: you can delete your account and the learning data stored in the cloud at any time from “Delete account” in the App (how to delete). Signing out only stops syncing on that device (your cloud data is kept). If you cannot delete it in the app, contact us at the address below.

3. Network connections

• Aozora Bunko (www.aozora.gr.jp): to fetch the catalogue and the text of works. What you read is not sent to the developer.
• Google (Firebase): for sign-in and syncing your reading data (only when signed in).
• Google: for serving ads, as described below.

4. Advertising

The App shows banner ads through Google AdMob so that it can be offered free of charge.

• Google and its advertising partners may use advertising identifiers and similar information to serve and measure ads. See Google’s Policies and Terms for details.
• You can turn off ad personalisation in your device settings (Android: Settings > Privacy > Ads; iOS: Settings > Privacy & Security > Tracking).
• Users in the EEA, the UK and Switzerland are shown a consent form on first launch. You can change your choices at any time from Settings > Ad privacy > Manage ad settings in the App.
• Declining ad tracking does not restrict reading, search, or offline saving in any way.
• Purchasing a premium plan (¥100/month, ¥500/year, or ¥1,000 one-time) removes ads from the App. Payments are processed by Google Play / the App Store; the developer never receives your card details.

5. Sharing with third parties

The developer does not sell or otherwise provide your personal information to third parties. Information handled in connection with advertising is governed by the Google policies referenced above.

6. Children’s privacy

The App is not directed to children under 13 and does not knowingly collect personal information from them.

7. Changes to this policy

This policy may be revised as features change or as required by law. The “last updated” date above will be changed when it is.

8. Contact

For questions about this policy or the App, please contact:

Contact: used.kiteretsu@gmail.com