MokumokuReading Bank

Mokumoku (Reading Bank)

Privacy Policy

Where your passbook is kept, and who gets to see it.

Last updated: October 29, 2026

Ryo Tsuzukihashi (the "Operator") handles the information of users of the app "Mokumoku (Reading Bank)" (the "App") as follows.

1. Information stored only on your device

Recorded books (title, author, price, date and so on), books you want to read, reading notes, cover photos you take, the passbook holder name, the passbook design and the series you follow for new releases are stored on your device. Unless you use backup or the friends features, the Operator never receives them.

2. Information kept when you create an account

  • The identifier received when you sign in with your Apple ID or Google account, and your email address (a relay address if you choose Apple's "Hide My Email"). If you connect both, the identifiers of both. If you start as a guest, an anonymous user ID
  • The display name and profile image you set
  • Your friends list, friend requests, and the books and messages sent or received as recommendations
  • If you subscribe to the paid plan, the records, reading notes and cover photos kept for backup

These are stored and processed in Firebase (Authentication, Cloud Firestore, Cloud Storage and Cloud Functions) provided by Google LLC.

3. Purposes of use

  • To back up and restore your data when you change devices
  • To let friends see each other's book lists and to deliver recommendations
  • To check the purchase status of the paid plan
  • To answer inquiries and respond to misuse
  • To learn which screens and features are used, so that we can improve the App

4. Information shown to friends

Friends can see your display name, profile image and list of recorded books. You can choose in the app's settings whether to show reading notes and amounts. Books and messages you send as recommendations are shown to the recipient.

5. Information sent to external services

The App uses the following external services. The information sent to each service and each company's privacy policy are as follows.

  • Book lookups and new release checks: openBD, Google Books, the National Diet Library Search, Kakao and open data from the National Central Library of Taiwan (imported into the Operator's Firebase) (we send ISBNs, search terms and series names; no information that identifies you is sent)
  • Currency conversion: Firebase Remote Config (receives reference rates to convert Japanese list prices into won or New Taiwan dollars; a Firebase installation ID is used, and no information that identifies you reaches the Operator)
  • Payments: RevenueCat (purchase records and an anonymous user ID issued by the App) https://www.revenuecat.com/privacy
  • Accounts and backup: Firebase (Google LLC) https://firebase.google.com/support/privacy
  • Preventing unauthorized access: Firebase App Check (uses Apple's App Attest on iPhone and iPad, and Google's Play Integrity on Android, to confirm that requests come from the genuine App; no information that identifies you reaches the Operator)
  • Usage analytics: Google Analytics for Firebase (Google LLC) (the screens you open, the type and result of actions such as recording or searching books, a rough range of your book count, device and app information, approximate region, and the app instance ID; on Android, also the advertising ID. We do not send book titles, authors, ISBNs, search words, the contents of reading notes, or email addresses) https://policies.google.com/technologies/partner-sites

The App does not show advertising. Usage analytics are used only to improve the App.

6. Links to bookstores

When you open a bookstore's page from the App, that store may collect information on its own, for example with cookies. How that information is handled is governed by each store's privacy policy.

The App's links to Amazon and Rakuten Books are Amazon Associates Program and Rakuten Affiliate links. When a book is purchased through such a link, the Operator may receive a referral fee. No information that identifies who made the purchase reaches the Operator.

7. About this website

This website is served with Firebase Hosting. If you choose a display language, that choice is saved in a cookie that lasts until you close your browser. We do not use cookies for analytics or tracking.

8. Provision to third parties

Except as required by law, the Operator does not provide personal information to third parties without your consent.

9. Retention and deletion

When you delete your account, the information stored on the Operator's servers is deleted. When the paid plan ends, the backup is deleted 7 days later. Information on your device is removed when you delete the App.

10. Security

The Operator takes appropriate measures, such as restricting access, to prevent unauthorized access to, leakage of or tampering with the information it keeps.

11. Requests for disclosure, correction or deletion

If you would like your information disclosed, corrected or deleted, please contact us below. We will respond after confirming your identity.

12. Changes to this policy

This policy may be changed as needed. Changes take effect when they are posted on this page.

Operator

Ryo Tsuzukihashi

Contact

ryo.tsuzukihashi@tsuzukit.com

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