denntatsu

Terms of Service

denntatsu — This English version is provided for reference only. The Japanese original is the authoritative text (Section 15).

These Terms of Service (the "Terms") set forth the conditions for using the mobile application "denntatsu" (the "App") and related services (collectively, the "Service") provided by En-Links LLC (the "Company"). By using the App, you (the "User") are deemed to have agreed to these Terms.

1. Company Information

2. Nature of the Service

  1. The App enables push-to-talk voice communication, text messaging, and sharing of disaster/SOS information with nearby devices through direct device-to-device communication (Bluetooth and Wi-Fi), without going through any server.
  2. The Service is provided on a best-effort basis. Communication depends on radio conditions, device capabilities and settings, distance between devices, obstacles, and the surrounding radio environment. The Company does not guarantee that communication will be established, that messages or voice will be delivered, or any particular communication quality or range. The Company's obligation to Users is limited to providing the opportunity for such direct device-to-device communication through the App.
  3. Because the Service operates without the Company's servers, the Company has no knowledge of, and no ability to intervene in, the content of individual communications.
  4. The handling of user information in the App is governed by the Company's separately published Privacy Policy.

3. Important Notes on the Disaster/SOS Features

  1. The disaster/SOS features of the App are not a substitute for official emergency calls (including 110/119 in Japan and the official emergency numbers of other countries). In an emergency involving danger to life or body, use official emergency services whenever possible.
  2. The Company does not guarantee that SOS or safety information sent through the disaster/SOS features will reach any third party. Whether and when such information is delivered depends on the presence of nearby devices, radio conditions, and other factors.
  3. The disaster/SOS features are provided free of charge to all Users.

4. Eligibility; No Account Required

  1. No account creation or registration of personal information is required to use the App.
  2. Minors must obtain the consent of a parent or legal guardian before using the App.

5. Restrictions on Commercial Use (Business Plan)

  1. The free plan and the paid plans for individuals (Section 6) may be used only for personal purposes (such as leisure, hobbies, family use, and disaster preparedness).
  2. Use of the App for business activities (including use as a means of communication at construction sites, event operations, security services, or any other work-related purposes) requires a corporate agreement (Business Plan) with the Company. For the Business Plan, please contact us at the address above.

6. Fees and Payment

  1. The basic features of the App are free of charge. On the free plan, voice calls in normal (non-disaster) mode are limited to 30 minutes per session (the disaster/SOS features have no such limit).
  2. The Company offers paid plans (such as a monthly plan and a day pass) whose benefits include removal of the time limit. The content and price of each plan are as displayed on the purchase screen.
  3. Purchases and payments for paid plans are processed through in-app purchases on Google Play (and, once the iOS version becomes available, the App Store; collectively, the "Stores"). Payment, cancellation (stopping auto-renewal), and refunds are governed by the terms and procedures of the applicable Store. To cancel a monthly plan, you must follow the Store's procedure before the next renewal date; no pro-rata refunds are provided for the remaining period (except as provided under the applicable Store's refund policy).
  4. Purchased paid plans can be restored using the "Restore purchases" function in the App with the same Store account.
  5. The scope of group unlocking provided by paid plans (for example, being limited to devices directly connected to the paying User) is as described on the purchase screen and in the App.

7. Prohibited Conduct

Users must not engage in any of the following when using the App:

  1. Acts that violate laws or public order and morals, criminal acts, or acts that facilitate them;
  2. Acts that infringe the rights of others (including intellectual property, privacy, and reputation);
  3. Harassment, threats, discriminatory speech, or other acts that cause disadvantage, damage, or distress to others;
  4. Sending false SOS or disaster information;
  5. Modifying or reverse-engineering the App, circumventing or falsifying the billing functions, or otherwise interfering with the operation of the Service;
  6. Using the App in a manner that violates radio or telecommunications laws;
  7. Any other act that the Company reasonably determines to be inappropriate.

If the Company becomes aware of a violation of these prohibitions (including through reports from third parties), it may take necessary measures that are feasible for the Company, such as suspending paid-plan benefits for the violating User, reporting to the Store operators, cooperating with the relevant authorities, or addressing the violation through App updates. Because the Service operates without servers, the Company cannot monitor individual communications or directly block the communications of any particular User (Section 2.3).

8. Intellectual Property

All intellectual property rights in the App and the Service belong to the Company or third parties holding legitimate rights. These Terms grant Users a non-transferable, non-exclusive license to use the App in accordance with these Terms, and do not transfer or license any other rights.

9. Responsibility for Interactions Between Users

Communications and information sharing through the Service take place directly between Users' devices. Any dispute arising between Users, or between a User and a third party, shall be resolved between the parties concerned, except where the Company is at fault (willful misconduct or negligence).

10. Disclaimer and Limitation of Liability

  1. The Company does not warrant that the Service is free from defects in fact or in law (including defects relating to safety, reliability, accuracy, completeness, effectiveness, fitness for a particular purpose, or security, as well as errors, bugs, and rights infringements).
  2. In cases of willful misconduct or gross negligence on the part of the Company, the Company shall be liable for damages in accordance with applicable law, and the limitations in this Section shall not apply.
  3. Where the Company is liable to a User for damage caused by its negligence (excluding gross negligence), whether in contract or in tort, the Company's liability shall be limited to damages that would ordinarily arise, and, for Users on a paid plan, capped at the total amount of fees paid by that User to the Company during the 12 months immediately preceding the occurrence of the damage.

11. Changes, Suspension, and Termination of the Service

  1. The Company may change the content of the Service or terminate its provision upon prior announcement by posting on this page, by in-app notice, or by other appropriate means; provided that in urgent or unavoidable cases, the Service may be changed or suspended without prior announcement.
  2. If the Service is terminated, the Company will take reasonable measures with respect to the remaining period of purchased paid plans, such as refunds in accordance with the applicable Store's procedures. Details will be provided in the termination announcement.

12. Amendment of These Terms

The Company may amend these Terms in accordance with Article 548-4 of the Civil Code of Japan (modification of standard terms of contract) where the amendment conforms to the general interest of Users, or where the amendment is not contrary to the purpose of the contract and is reasonable in light of the necessity of the amendment, the appropriateness of the amended terms, and other circumstances relating to the amendment. Amended Terms will be announced by posting on this page or by other appropriate means, and will take effect on the effective date specified in the announcement.

13. Assignment

  1. Users may not assign or pledge as security their status under these Terms or any rights or obligations under these Terms to any third party without the Company's prior written consent.
  2. If the Company transfers the business relating to the Service to a third party (whether by business transfer, corporate split, or otherwise), the Company may, in connection with such transfer, assign to the transferee the contractual status, rights, and obligations under these Terms and related information.

14. Severability

If any provision of these Terms, or any part thereof, is held invalid or unenforceable under applicable law, the remaining provisions of these Terms, and the remaining parts of any partially invalid or unenforceable provision, shall continue in full force and effect.

15. Language

These Terms are executed in Japanese, which shall be the authoritative text. This English version is provided for reference only; in the event of any discrepancy between the Japanese original and any translation, the Japanese original shall prevail.

16. Governing Law and Jurisdiction

These Terms are governed by and construed in accordance with the laws of Japan. Any dispute between the Company and a User in connection with the Service shall be subject to the exclusive jurisdiction of the Kagoshima District Court as the court of first instance.

17. Effective Date

Effective July 11, 2026.

Last updated: July 11, 2026