Terms of Service

Effective Date: May 29, 2026 · Last Updated: May 29, 2026

These Terms of Service (the "Terms") govern your access to and use of the NumSum mobile application and any related services (collectively, the "App"), which are provided by the NumSum team ("we," "us," or "our"). Please read these Terms carefully before using the App.

1. Acceptance of Terms

By downloading, installing, accessing, or using the App, you acknowledge that you have read, understood, and agree to be bound by these Terms and by our Privacy Policy, which is incorporated by reference. If you do not agree to these Terms, you may not download, install, access, or use the App.

If you are using the App on behalf of a minor for whom you are a parent or legal guardian, you represent and warrant that you have the authority to accept these Terms on that minor's behalf and agree to be responsible for that minor's use of the App.

2. License Grant

Subject to your continuing compliance with these Terms, we grant you a personal, non-exclusive, non-transferable, non-sublicensable, revocable, limited license to download, install, and use one copy of the App, in object-code form only, on any compatible device that you own or control, solely for your personal, non-commercial entertainment purposes.

This license is conditioned on, and limited by, the additional terms imposed by the digital distribution platform from which you obtained the App (for example, Apple Inc.'s Licensed Application End User License Agreement for the Apple App Store, or Google LLC's Google Play Terms of Service). In the event of any conflict between these Terms and the applicable platform terms, the platform terms will control with respect to the licensing of the App through that platform.

3. Prohibited Uses

You agree that you will not, and will not permit any third party to:

• reverse engineer, decompile, disassemble, or otherwise attempt to discover the source code or underlying ideas, algorithms, file formats, or non-public application programming interfaces of the App, except to the extent that such restriction is expressly prohibited by applicable law;
• modify, translate, adapt, or create derivative works based on the App;
• copy, distribute, sublicense, rent, lease, lend, sell, resell, transfer, or otherwise commercially exploit the App or any portion of it;
• remove, alter, or obscure any proprietary notices (including copyright and trademark notices) on or in the App;
• use the App in any manner that could damage, disable, overburden, or impair any device, system, or network on which the App runs;
• use the App to violate any applicable law, regulation, or right of a third party;
• use any automated means (including bots, scrapers, or scripts) to interact with the App; or
• circumvent or attempt to circumvent any technical limitations or protection mechanisms in the App.

4. Intellectual Property

The App, including all software, source code, object code, graphics, user interface, sound effects, music, puzzles, level designs, text, and all other content contained therein, together with all associated trademarks, service marks, logos, and the "NumSum" name, are the exclusive property of the NumSum team or its licensors and are protected by applicable copyright, trademark, and other intellectual property laws. Except for the limited license expressly granted in Section 2, we and our licensors reserve all rights in and to the App.

5. User Content

The App does not provide functionality for you to upload, post, transmit, or otherwise make available any text, images, audio, video, or other content to us or to other users. To the extent any future version of the App enables you to submit content, these Terms will be updated to reflect the corresponding rights and obligations.

6. Disclaimer of Warranties

The app is provided "as is" and "as available," with all faults and without warranty of any kind. To the maximum extent permitted by applicable law, we and our licensors expressly disclaim all warranties, whether express, implied, statutory, or otherwise, including, without limitation, any warranties of merchantability, fitness for a particular purpose, title, non-infringement, accuracy, quiet enjoyment, and any warranties arising out of course of dealing, course of performance, or usage of trade.

We do not warrant that the App will meet your requirements, that the operation of the App will be uninterrupted or error-free, that defects will be corrected, or that the App or the servers (if any) that make it available are free of viruses or other harmful components.

7. Limitation of Liability

To the maximum extent permitted by applicable law, in no event will we, our affiliates, officers, directors, employees, agents, or licensors be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, including without limitation damages for lost profits, lost data, business interruption, or any other commercial damages or losses, arising out of or related to your use of, or inability to use, the App, however caused, regardless of the theory of liability (contract, tort, or otherwise), and even if we have been advised of the possibility of such damages.

In jurisdictions that do not allow the exclusion or limitation of liability for consequential or incidental damages, our liability is limited to the greatest extent permitted by law. To the maximum extent permitted by applicable law, our total cumulative liability arising out of or related to the App or these Terms will not exceed the greater of (a) the amount you paid us for the App in the twelve (12) months preceding the event giving rise to the claim, or (b) one thousand Japanese yen (JPY 1,000).

8. Indemnification

To the maximum extent permitted by applicable law, you agree to indemnify, defend, and hold harmless us and our affiliates, officers, directors, employees, agents, and licensors from and against any and all claims, liabilities, damages, losses, costs, and expenses (including reasonable attorneys' fees) arising out of or related to (a) your use or misuse of the App, (b) your violation of these Terms, or (c) your violation of any applicable law or any right of a third party.

9. Termination

These Terms remain in effect until terminated by you or by us. You may terminate these Terms at any time by deleting the App from all devices on which it is installed and ceasing all use of the App. We may suspend or terminate your license to use the App at any time, with or without notice, if we believe that you have breached these Terms or if we cease to offer the App. Upon termination, your right to use the App will immediately cease. Sections 3 through 11 will survive any termination of these Terms.

10. Governing Law and Jurisdiction

These Terms, and any dispute arising out of or in connection with them or the App, are governed by and construed in accordance with the laws of Japan, without regard to its conflict-of-laws rules. You and we agree that the Tokyo District Court (東京地方裁判所) will have exclusive jurisdiction as the court of first instance over any dispute arising out of or in connection with these Terms or the App.

Nothing in this Section limits any non-waivable consumer-protection rights you may have under the mandatory laws of your country of residence.

11. Changes to These Terms

We may revise these Terms from time to time. When we do so, we will update the "Last Updated" date at the top of these Terms. If we make a material change, we will use reasonable means to notify you, for example through an in-app notice or the App Store listing. Your continued use of the App after the effective date of the revised Terms constitutes your acceptance of those revised Terms. If you do not agree to the revised Terms, you must stop using the App and uninstall it from your devices.

12. Miscellaneous

These Terms, together with the Privacy Policy, constitute the entire agreement between you and us regarding the App and supersede any prior agreements regarding the same subject matter. If any provision of these Terms is held to be invalid or unenforceable, that provision will be limited or eliminated to the minimum extent necessary, and the remaining provisions will remain in full force and effect. Our failure to enforce any right or provision of these Terms will not be deemed a waiver of that right or provision. You may not assign or transfer these Terms or any rights granted hereunder without our prior written consent; any attempted assignment in violation of this provision is void. We may freely assign these Terms.

13. Apple-Specific Terms

If you obtained the App from the Apple App Store, you acknowledge and agree that (a) these Terms are concluded between you and us only, and not with Apple Inc. ("Apple"); (b) we, not Apple, are solely responsible for the App and its content; (c) Apple has no obligation to furnish any maintenance and support services with respect to the App; (d) in the event of any failure of the App to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price (if any) for the App to you, and to the maximum extent permitted by applicable law, Apple will have no other warranty obligation whatsoever with respect to the App; (e) Apple is not responsible for addressing any claims you or any third party may have relating to the App or your possession or use of it; and (f) Apple and its subsidiaries are third-party beneficiaries of these Terms and, upon your acceptance of these Terms, will have the right (and will be deemed to have accepted the right) to enforce these Terms against you as a third-party beneficiary.

14. Contact

If you have any questions about these Terms, contact information is available within the App settings.