Terms of Service

1Application

These Terms apply to the app "Well Rhythm" (the "App") provided by LO KAHEI (the "Provider"). By using the App, you agree to these Terms. Any additional guidelines, help articles, or policies published by the Provider (collectively "Supplemental Terms") form part of these Terms.

• Provider: LO KAHEI
• Enquiries: from within the app (Settings → Feedback)

2Definitions

Unless otherwise stated, the following terms have the meanings given below.

• User: Any individual or entity using the App.
• Account: The credentials registered by a User to access certain features of the App.
• Sharing: The act of transmitting information to a third party via the App's sharing feature.
• Personal Data: Data including personal information and sensitive personal information as defined in the Privacy Policy.

3Purpose & Medical Disclaimer

1. The App is a self-care support tool that helps you track and understand trends in your wellbeing based on menstrual cycle data, barometric pressure, and weather.
2. The App is not a medical device and is not intended for diagnosis, treatment, or prevention of any medical condition. Predictions and suggestions provided by the App are for reference only and do not replace the advice of a medical professional. If you have health concerns, please consult a doctor.
3. The language in this section will be reviewed whenever new features are added to ensure compliance with applicable medical device regulations (e.g., Japanese PMDA, FDA, etc.).

4Accounts & Authentication

1. Certain features (sharing, subscriptions, cloud backup, etc.) require registration with an email address or equivalent.
2. You are responsible for keeping your registration information accurate and up to date, and must not allow third parties to use your account.
3. If you suspect unauthorised use of your account, you must notify the Provider promptly.
4. The Provider will take reasonable steps to assist with issues caused by account management failures (e.g., a compromised email account), except where such failures are due to your own intentional or grossly negligent conduct.

5Pricing & Payments

1. Pricing, payment methods, cancellation, and refunds for paid features are governed by the terms of the Apple App Store or Google Play Store through which you purchase.
2. Subscriptions may renew automatically. To cancel auto-renewal, follow the cancellation procedure in the relevant store.
3. Refunds are subject to store policy.
4. Material changes to pricing or billing will be notified via in-app notice at least 30 days before the change takes effect.

6User Obligations

1. You must not use the App in violation of applicable law or public order, in a manner that infringes the rights of others, or to perform unauthorised access, reverse engineering, or interference with the service.
2. When using the sharing feature, you are responsible for ensuring that the recipient has consented and that any applicable legal restrictions (e.g., regarding minors) are satisfied.
3. You must comply with any usage guidelines published by the Provider.
4. Image submissions and masking of personal information: Attaching images to the in-app feedback box is optional. If you attach an image, you are responsible for ensuring that personal information such as names, faces, addresses, or contact details has been masked (e.g., blacked out) beforehand. If you mistakenly submit an unmasked image containing personal information, the Provider (administrator) will reject the submission, notify you at your registered email that an image containing personal information was submitted, and delete the image. However, because reviewing the content is unavoidable for moderation, the Provider bears no liability for the mere fact that the administrator viewed the image once it was uploaded.

7Sharing & Liability

How sharing works:

• Sharing occurs only when you explicitly enable it. The scope of what is shared is limited to what you select.
• The Provider only relays the encrypted "sharing envelope" on its servers and does not decrypt it.

Provider's responsibility:

• The Provider applies reasonable, industry-standard security measures (encryption, key management, access control, log auditing, etc.) to the sharing feature.
• The Provider is liable for damages directly caused by its own intentional or grossly negligent conduct.
• The Provider is not liable for damages caused by your intentional or grossly negligent conduct, mismanagement by the sharing recipient, or sophisticated third-party attacks on your device (other than those that circumvent the Provider's reasonable security measures).

Incident response:

• Upon receiving a report of misuse, the Provider will investigate and respond within a reasonable scope and notify affected users as necessary. In the event of a serious personal data breach, the Provider will notify the relevant authorities and affected users promptly in accordance with applicable law.

Operation logs:

• Logs of sharing and authentication activity are retained for troubleshooting and security investigation. On-device audit logs (30 days) are viewable in Settings and are deleted automatically. Server-side access records (90 days) are then deleted.

8Intellectual Property

1. All copyright, trade marks, and other intellectual property rights in the App belong to the Provider or their respective owners.
2. You may not copy, modify, or redistribute all or any part of the App without the Provider's prior written consent.
3. For content you submit via the feedback board or enquiry form, you warrant that you own or have the right to submit such content and grant the Provider a non-exclusive, royalty-free, worldwide licence to use it for providing and improving the service and for anonymous publication on the public board. On-device health data and encrypted sharing data are not received or viewed by the Provider and are not subject to this clause.

9Disclaimers & Damages

1. The Provider will operate the App appropriately and endeavour to provide a useful service to users.
2. Where damage to you is caused by circumstances attributable to the Provider, the Provider's liability (excluding cases of the Provider's own intentional or grossly negligent conduct) is limited to the total fees paid by you to the Provider in the 12 months preceding the damage.
3. Consumer protection: The limitation in clause 2 applies only to corporate or business-to-business contracts; it does not apply where it would be invalidated by applicable mandatory consumer protection laws. Consumers retain all protections under applicable law.
4. The App's predictions and suggestions are for reference only. You are responsible for making your own final judgements. For medical matters, please follow the advice of a medical professional.

10Changes & Termination

1. The Provider may change, suspend, or terminate the App. However, the Provider will not make changes that are materially detrimental to users without legitimate reason.
2. Material changes (to pricing, data handling, or the removal of key features) will be notified via in-app notice at least 30 days in advance, except where circumstances make this impracticable.
3. The Provider is not liable for damages arising from such changes, except where caused by the Provider's own intentional or grossly negligent conduct.

11Personal Data

1. The handling of your personal data is governed by these Terms and the Privacy Policy.
2. You may request disclosure, correction, suspension of use, or erasure of your personal data from the Provider (subject to legal limitations) as described in the Privacy Policy.

12Age Restrictions

1. The App is intended for users aged 13 and over. Users under 13 may not use the App. Users aged 13–17 must have parental consent before using the App. The Provider will verify age and obtain parental consent (via an in-app consent form) during onboarding.
2. Further details on parental consent procedures and special measures for the handling of minors' data are set out in the Privacy Policy.

13Governing Law

1. These Terms are governed by the laws of Japan.
2. Disputes relating to the App shall be subject to the exclusive jurisdiction of the Saitama District Court as the court of first instance. However, where you are a consumer, the court with jurisdiction under the Code of Civil Procedure shall apply.

14Miscellaneous

1. If any provision of these Terms is found to be invalid, the remaining provisions shall continue in full force and effect.
2. Matters not covered by these Terms shall be resolved through good-faith discussions between the Provider and the User.
3. Language: The Japanese text of these Terms is the authoritative version. The English, Traditional Chinese, and any other translations are provided for convenience only; in the event of any discrepancy, the Japanese version shall prevail.

Supplemental provisions: These Terms take effect on 2026-06-30.