Terms of Service

Last updated: May 4, 2026

1. Introduction

These Terms of Service (hereinafter referred to as "Terms") set forth the conditions for use of the mobile application "BIZ15" (hereinafter referred to as "Application") and its accompanying services (hereinafter referred to as "Service") provided by Akira Kawata (hereinafter referred to as "Service Provider").

By downloading or using the Application, you (hereinafter referred to as "User") are deemed to have agreed to these Terms. If you do not agree to these Terms, you may not use the Application.

Please also review our Privacy Policy when using the Service. The Privacy Policy is incorporated by reference as part of these Terms.

The Application may be distributed through the App Store of Apple Inc. (hereinafter referred to as "Apple"). Use of the iOS version of the Application may also be subject to Apple's standard End User License Agreement (EULA). In the event of a conflict between these Terms and Apple's EULA, Apple's EULA shall prevail.

2. Definitions

  • "Application" means the mobile application named "BIZ15" provided by the Service Provider.
  • "Service" means all services provided through the Application (including learning content, AI chat features, and advertising display).
  • "User" means any individual who downloads, installs, or uses the Application.
  • "Content" means all information contained in the Application, including text, images, audio, lesson data, and any other materials.

3. License Grant

Subject to your compliance with these Terms, the Service Provider grants you a non-exclusive, non-transferable, and revocable license to use the Application for personal, non-commercial purposes.

For the iOS version of the Application, the license is limited to a non-transferable license to use the Application on any Apple-branded products that you own or control, as permitted by the Usage Rules set forth in the Apple Media Services Terms and Conditions, except that such Application may be accessed and used by other accounts associated with the purchaser via Family Sharing or volume purchasing. The usage rules in these Terms shall not conflict with the Apple Media Services Terms and Conditions as of the Effective Date.

You may not:

  • Reverse engineer, decompile, disassemble, or otherwise attempt to derive the source code of the Application.
  • Modify, adapt, or create derivative works of the Application.
  • Redistribute, sell, lend, or sublicense the Application.
  • Use any part or all of the Application for commercial purposes.
  • Access the Service using automated means (bots, scrapers, etc.).

4. Conditions of Use and Prohibited Conduct

The Application is intended for users aged 12 and older. Children under the age of 13 may not use the Application without parental consent.

When using the Service, you may not:

  • Violate any laws, regulations, or public order and morals.
  • Infringe upon the copyrights, trademark rights, or other intellectual property rights of the Service Provider or any third party.
  • Damage the honor, privacy, or other rights or interests of the Service Provider or any third party.
  • Engage in harassment, defamation, or any behavior that causes discomfort to others.
  • Interfere with the operation of the Service or place excessive load on the systems.
  • Transmit false information or obtain authentication through improper means.
  • Exploit or disclose to third parties any security vulnerabilities in the Application.

The Service Provider may, without prior notice, suspend the provision of the Service or restrict a User's access if the User violates these Terms.

5. Service Content

AI Features

The Application includes an AI chat feature that uses the OpenAI API service. Responses generated by the AI feature are provided as reference information, and no guarantee is made regarding their accuracy, completeness, or usefulness. The User may not hold the Service Provider liable for any damages arising from reliance on AI feature responses.

Advertising

The Application may display advertisements through Google AdMob. The content of advertisements may not be under the control of the Service Provider, and the Service Provider assumes no responsibility for the services or products linked from advertisements.

Intellectual Property

All copyright and other intellectual property rights in the Content contained in the Application (including lessons, phrases, dialogues, quizzes, and designs) belong to the Service Provider. You may use the Application only within the scope expressly permitted by these Terms.

6. Payments

Currently, the basic features of the Application are available free of charge. In the future, paid plans (in-app purchases or subscriptions) may be introduced to provide access to additional features and content.

When paid plans are introduced, the following conditions will apply:

  • Pricing, payment methods, and purchase details will be clearly indicated within the Application or on the App Store at the time of purchase.
  • In-app purchases on the iOS version are processed through Apple's In-App Purchase (IAP) system and are subject to Apple's Terms of Service.
  • Subscriptions will auto-renew and can be canceled at any time through the App Store or Google Play account settings.
  • Refunds for purchased digital content may not be available except as required by applicable law.

The relevant provisions of these Terms will be updated when paid services are introduced.

7. Disclaimer

The Application and Service are provided "AS IS." The Service Provider makes no warranties, express or implied, regarding the merchantability, accuracy, reliability, or fitness for a particular purpose of the Application.

The Service Provider assumes no responsibility for:

  • Damages arising from the use or inability to use the Application.
  • Failure of the Application to function properly due to operating system changes, device incompatibility, or changes in third-party service specifications.
  • The accuracy or completeness of information contained in the Application's Content.
  • Disputes arising between Users or between Users and third parties.
  • Temporary suspension of the Service, data loss, or modifications to the Service.

8. Limitation of Liability

Damages caused by the intentional acts or gross negligence of the Service Provider are excluded from the application of this section. However, this limitation does not apply to damages to the User's life, body, or property caused by the Service Provider's negligence (excluding gross negligence).

Excluding the cases specified in the preceding paragraph, the Service Provider's total liability for damages related to the Service shall be limited to the total amount of fees paid by the User for the Service during the immediately preceding three-month period (or 1,000 yen if such amount is less than 1,000 yen).

The Service Provider shall not be liable for any indirect, incidental, special, consequential, or exemplary damages, or lost profits arising in connection with the Service.

9. Changes and Termination

Changes to Terms

The Service Provider may revise these Terms at any time. When changes are made, the new Terms will be posted on this page. The Service Provider will endeavor to provide reasonable advance notice of significant changes through in-app notifications or other means.

Continued use of the Application after changes are posted constitutes your acceptance of the revised Terms.

Termination

You may terminate your use of the Service at any time by uninstalling the Application.

The Service Provider may terminate all or part of the Service with prior notice. In such cases, the Service Provider shall not be liable for damages or other compensation to Users to the extent permitted by applicable law.

10. Governing Law, Jurisdiction, and Miscellaneous

These Terms shall be governed by and construed in accordance with the laws of Japan.

Any disputes arising out of or in connection with these Terms shall be subject to the exclusive jurisdiction of the Chiba District Court or the Tokyo District Court as the court of first instance.

If any provision of these Terms is held to be invalid or unenforceable by law, the remaining provisions shall continue in full force and effect.

Apple Provisions (iOS Version)

With respect to the iOS version of the Application, you and the Service Provider acknowledge and agree as follows:

  • Parties to the Agreement: These Terms constitute an agreement between you and the Service Provider only, and not with Apple. The Service Provider, not Apple, is solely responsible for the Application and the content thereof.
  • Maintenance and Support: The Service Provider is solely responsible for providing any maintenance and support services with respect to the Application. Apple has no obligation whatsoever to furnish any maintenance and support services with respect to the Application.
  • Warranty and Refund: In the event of any failure of the Application to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price for the Application to you. To the maximum extent permitted by applicable law, Apple will have no other warranty obligation whatsoever with respect to the Application, and any other claims, losses, liabilities, damages, costs, or expenses attributable to any failure to conform to any warranty will be the Service Provider's sole responsibility.
  • Product Claims: The Service Provider, not Apple, is responsible for addressing any claims of yours or any third party relating to the Application or your possession and/or use of the Application, including but not limited to: (i) product liability claims; (ii) any claim that the Application fails to conform to any applicable legal or regulatory requirement; and (iii) claims arising under consumer protection, privacy, or similar legislation. These Terms do not limit the Service Provider's liability to you beyond what is permitted by applicable law.
  • Intellectual Property Infringement Claims: In the event of any third-party claim that the Application or your possession and use of the Application infringes that third party's intellectual property rights, the Service Provider, not Apple, will be solely responsible for the investigation, defense, settlement, and discharge of any such intellectual property infringement claim.
  • Legal Compliance: You represent and warrant that (i) you are not located in a country that is subject to a U.S. Government embargo, or that has been designated by the U.S. Government as a "terrorist supporting" country; and (ii) you are not listed on any U.S. Government list of prohibited or restricted parties.
  • Third Party Terms of Agreement: You must comply with applicable third-party terms of agreement when using the Application.
  • Third Party Beneficiary: Apple and Apple's subsidiaries are third-party beneficiaries of these Terms, and upon your acceptance of the terms and conditions of these Terms, Apple will have the right (and will be deemed to have accepted the right) to enforce these Terms against you as a third-party beneficiary thereof.

Contact

For questions regarding these Terms, please contact:

Akira Kawata
Address: 960-2 Nishihirai, Nagareyama-shi, Chiba-ken 270-0156, Japan
Email: eerf0309+aurum@gmail.com
Phone: +81 70 9009 0565