Terms of Service

Last updated: 18 May 2026

These terms (“Terms”) govern your use of the Tsumihon mobile app and the website at tsumihon.app (together, “Tsumihon”). By installing, opening, or otherwise using Tsumihon, you agree to these Terms. If you don’t agree, don’t use Tsumihon.

Questions: support@tsumihon.app.

What Tsumihon is

Tsumihon is a personal library manager for doujinshi and manga. It catalogs books you own or have added, fetches metadata and cover art from public external sources, and shows them in a built-in reader. We do not host, sell, distribute, or relay any of the books or images themselves — those requests go directly from your device to the source you chose.

Eligibility

You must be at least 18 years old to use Tsumihon. Some content surfaced through external catalog sources is adult and is not appropriate for minors. By using Tsumihon you confirm that you meet this age requirement and that doing so is lawful in your jurisdiction.

Your account

Using Tsumihon requires an account. You are responsible for:

We may suspend or terminate accounts that abuse the service, attempt to circumvent rate limits or quotas, or violate these Terms.

Acceptable use

You agree not to:

External catalog sources

Tsumihon can query public external catalog sources you choose to enable. We are not affiliated with any external source and have no control over their content, availability, or terms. Requests go directly from your device to the source, using whatever credentials you provided.

You are solely responsible for:

If an external source goes offline, changes its API, or bans your account, that is between you and them — Tsumihon cannot restore access on your behalf.

Cloud sync

Cloud sync stores your library metadata and settings so they appear on your other devices. Sync is provided “as is” — we make reasonable efforts to keep it available, but we don’t guarantee uninterrupted service. Sync is not a backup service. Keep your own backup if your library matters to you (export from the app’s settings).

We may apply reasonable rate limits and quotas on the sync backend to keep the service healthy.

Purchases and subscriptions

Purchases of Tsumihon, or of in-app entitlements, are processed by the platform you installed Tsumihon from (the device’s app store). The app store’s payment terms apply, and refunds are handled by them — not by us.

Auto-renewing subscriptions continue until you cancel through the same app store.

Optional AI features

Some features are off by default and require you to provide a credential for an external AI provider of your choice. When enabled, the image or text you select is sent from your device directly to that provider. You are responsible for any costs and for complying with the provider’s terms when you enable such a feature. We do not proxy or store your credential.

Intellectual property

Tsumihon (the app, the website, the brand) is owned by its creators and licensed to you, not sold. You receive a personal, non-exclusive, non-transferable, revocable license to use Tsumihon for personal, non-commercial purposes. All other rights are reserved.

Books, cover art, tags, descriptions, and other content shown in Tsumihon are the property of their respective rights holders. You are responsible for ensuring your use of that content complies with applicable copyright law in your jurisdiction.

Disclaimer

Tsumihon is provided “as is” and “as available”, without warranties of any kind — express or implied — including merchantability, fitness for a particular purpose, accuracy of metadata, availability of any external source, or non-infringement.

We don’t warrant that:

Limitation of liability

To the maximum extent permitted by law, in no event will Tsumihon, its creators, or its contributors be liable for any indirect, incidental, special, consequential, or punitive damages, or any loss of data, profits, or goodwill, arising out of or relating to your use of Tsumihon — whether based on warranty, contract, tort, or any other legal theory.

Where liability cannot be excluded by law, our total liability is limited to the amount you actually paid us for Tsumihon in the twelve months preceding the claim, or USD 50, whichever is greater.

Indemnification

You agree to defend, indemnify, and hold harmless Tsumihon and its creators from any claim, demand, loss, or expense (including reasonable legal fees) arising out of your use of Tsumihon, your breach of these Terms, or your violation of any law or third-party right.

Termination

You can stop using Tsumihon at any time — uninstall the app, and (optionally) delete your account from the app’s settings. We may suspend or terminate your access to Tsumihon (especially the cloud sync backend) at any time if you violate these Terms or if continuing to provide service to you becomes impractical.

Sections that by their nature should survive termination (intellectual property, disclaimer, limitation of liability, indemnification, governing law) survive termination.

Changes to the app and to these Terms

We may add, change, or remove features at any time. We may update these Terms when we change the service or when the law requires it. If we make material changes we will update the date at the top of this page and, where appropriate, surface a notice in the app. Continued use after a change means you accept the updated Terms.

Governing law

These Terms are governed by the laws of Japan, without regard to its conflict-of-laws rules. Any dispute arising out of or relating to Tsumihon will be brought exclusively in the courts of Tokyo, Japan, except where mandatory consumer-protection law in your country requires otherwise.

Contact

Questions about these Terms:

See also our Privacy Policy.