Terms of Use

Last updated: 21 August 2026

These Terms of Use (the "Terms") govern the use of the iOS application "Moyahodoki" (English name: NightVent; the "App") provided by Revot Co., Ltd. ("we", "us" or "our"). By downloading or using the App, you are deemed to have agreed to these Terms. If you do not agree, please do not use the App.

1. Scope

• These Terms apply to all relations between us and you in connection with the use of the App
• Any additional notices or guidelines that we post in the App or on our website form part of these Terms
• Our handling of personal and user information in the App is governed by our Privacy Policy

2. Nature of the App — you are talking to an AI

The App is a chat application in which a large language model (AI) generates text in order to listen and respond to what you say. This section is particularly important, so please read it in full.

• Responses are produced by an AI, not by a human counsellor, adviser or professional. "Yoruko", "Akane" and "Sou" are fictional personas within the App and are not real people
• No human operator responds to your input in real time
• Text generated by an AI may contain content that is factually wrong, inaccurate or otherwise inappropriate. We do not warrant its accuracy, completeness or usefulness
• The App does not provide emergency reporting, welfare checks, safety monitoring or crisis intervention

3. Not medical, legal or other professional advice

The App does not provide medical treatment, psychotherapy, counselling, diagnosis, therapy, legal services or any other professional service.

• Responses from the App are not a substitute for diagnosis, treatment or advice from a physician, clinical psychologist, certified public psychologist, psychiatric social worker, lawyer, tax accountant or other qualified professional
• Responses from the App are not intended to diagnose, treat or prevent any disease and do not form a basis for any medical judgement
• Where you need to make a decision about your health, your mental state, your legal position or your finances, always consult a qualified professional
• You must not act contrary to a physician's diagnosis, prescription or treatment plan — including by stopping or altering medication — on the basis of a response from the App
• Using the App is not intended to discourage you from seeking professional support. If you feel you need it, please reach out to a professional service without hesitation

We are not responsible for consequences arising from your treating a response from the App as if it were professional advice and acting accordingly. This is subject to Section 14.4, which provides that nothing in these Terms displaces mandatory law.

4. Eligibility and age

• Because the App handles adult subject matter relating to relationships and personal life, it is intended only for users aged 17 or over
• If the law of the country or region in which you live requires a higher age for use of the App, you must have reached that age
• If you are a minor under the law of your place of residence, use of the App and any purchase requires the prior consent of a parent or other legal representative. Even then, the age limits above are not relaxed

5. Handling of your conversations

• Conversation records are, as a rule, stored only on your device. We do not keep a copy
• In order to generate the AI's reply, conversation text is transmitted through our relay server to an AI provider. Details are set out in our Privacy Policy
• You should use reasonable efforts not to enter into a conversation any information identifying you or a third party, such as names, addresses, phone numbers, employers, account numbers or passwords
• If data on your device is lost through deletion of the App, a device reset or similar, we cannot restore it

6. Free use

• Without a subscription, you may send five messages per day. This allowance resets on the change of date in Coordinated Universal Time (UTC), not Japan Standard Time
• The number of messages available without charge may change according to how the service is operated. We will give notice of any change by appropriate means such as an in-app notice
• The App displays no advertising of any kind

7. In-app purchases and auto-renewing subscription

The App offers an auto-renewing subscription, "Moyahodoki Premium", which extends its functionality.

7.1 What Premium provides

• Removal of the five-messages-per-day limit (subject to Section 7.5)
• Use of all three listeners, switchable at any time
• No advertising (the App does not display advertising in any case)

7.2 Terms and prices

The prices displayed on the purchase screen in the App are definitive. Prices in Japan as at August 2026 are set out below. Prices vary by country and region and may change in future.

7.3 Payment, renewal and cancellation

• Payment is charged to your Apple Account (Apple ID) upon confirmation of purchase
• The subscription renews automatically at the same price unless auto-renewal is turned off at least 24 hours before the end of the current period. The renewal charge is applied within the 24 hours before the end of that period
• You can manage the subscription and turn off auto-renewal yourself at any time after purchase, under Settings > [your name] > Subscriptions on your device, or from the App Store subscription management page
• We cannot cancel a subscription on your behalf from within the App. Cancellation must be made through your Apple Account settings
• If you cancel part-way through a period, amounts already paid are not refunded on a pro-rata basis, and Premium features remain available until the end of the period already paid for
• Given the nature of digital content, refunds and cancellations are not, as a rule, available once the purchase has completed. Whether a refund is granted is determined by Apple in accordance with the Apple Media Services Terms and Conditions and Apple's refund policy. To request a refund, contact Apple at reportaproblem.apple.com
• Using "Restore Purchases" with the same Apple Account restores your subscription on other devices

7.4 Free trial

• A seven-day free trial is offered on the annual plan to eligible users. If you have previously used a free trial or promotional offer in the same subscription group, you are not eligible
• Unless you cancel at least 24 hours before the end of the trial period, the annual price will be charged automatically when the trial ends.
• Any unused portion of a free trial is forfeited when you purchase a paid subscription

7.5 Usage limit under Premium

Even with Premium, a daily cap on the number of messages that may be sent applies (300 per day as at August 2026), for the stability of the service and the prevention of abuse. Ordinary use is not expected to reach this cap. The cap may change according to how the service is operated.

7.6 After a subscription ends

When Premium ends, your existing conversation records are not deleted. You can still read them at any time; only the number of messages you may send each day returns to the free allowance.

8. Your input and reporting

• You are responsible for the text you enter
• If you consider that a response from the AI contains inappropriate content, you can report it to us by pressing and holding that response and selecting "Report this response". The report is sent as an email to contact@revot.jp
• On receiving a report, we will review it within a reasonable period and, where we consider it necessary, will take appropriate measures such as amending the instruction prompt, adding filters, or reporting the matter to the AI provider
• You may remove a conversation and the responses within it from your device by deleting that conversation

9. Prohibited conduct

You must not do any of the following when using the App.

• Use the App to defame, threaten or discriminate against another person
• Use the App to plan or encourage criminal conduct, self-harm, harm to others, or any other unlawful or harmful act
• Present a response from the App to a third party as though it were a diagnosis or advice from a qualified professional
• Redistribute or publish a response from the App while representing that we or the AI are a real professional
• Modify, reverse engineer, decompile, disassemble or otherwise analyse the App
• Gain unauthorised access to the App or our servers, make bulk automated requests, or place an undue load on them
• Analyse the App's communications, or use our servers through the App for any purpose other than the App itself
• Copy, redistribute, lend, publicly transmit or commercially exploit the App
• Enter a third party's personal information unnecessarily and without that person's consent
• Infringe the rights or interests of us or of any third party
• Violate any law or public order and morals
• Any other conduct that we reasonably consider inappropriate

If we reasonably determine that you have breached this Section, we may suspend your use of all or part of the App without prior notice.

10. Avoiding over-reliance

The App is not provided in order to keep you from real relationships or professional support. If you feel that relying on the App alone is not right for you, please consider turning to family, friends, a support service at your workplace or school, or a medical or public counselling institution.

11. Intellectual property

• Copyright and other intellectual property rights in the App and all related content (programs, images, designs, text, persona settings and so on) belong to us or to the rightful owner
• "Moyahodoki" and "NightVent" are marks we use for the App
• You are granted only a non-exclusive, non-transferable right to use the App for private, non-commercial purposes in accordance with these Terms
• Rights in the text you enter remain with you. We use it only to the extent necessary to generate the AI's reply

12. Changes to, suspension and discontinuation of the App

• We may change all or part of the App, or discontinue it, on prior notice to users (or on subsequent notice in urgent cases)
• We may temporarily suspend the App for system maintenance, faults, faults at the AI provider, communication line failure or other unavoidable reasons
• If we discontinue the App, we will endeavour to give reasonable advance notice. We will deal with subscriptions that still have time remaining in good faith and in accordance with applicable law

13. No warranty as to AI responses

• We do not warrant that AI responses will be accurate or current, that they will suit any particular purpose of yours, or that they will produce any particular outcome such as an improvement in mood or the resolution of a problem
• We do not warrant that the App will always operate correctly or without error or interruption
• We note in advance that the quality and speed of responses may vary because of specification changes, suspension of service or other matters beyond our control at the AI provider

14. Limitation of liability

1. We are not liable for loss arising from use of, or inability to use, the App, except where we have acted intentionally or negligently.
2. Where we are liable in damages, then except where we have acted intentionally or with gross negligence, the amount of damages is limited to the total amount you actually paid in respect of the App (including payments made through the App Store) in the 12 months immediately preceding the loss. Where you have paid nothing, that limit is JPY 3,000.
3. Except where we have acted intentionally or with gross negligence, we are not liable for lost profits or other special damages.
4. Nothing in this Section or elsewhere in these Terms excludes or restricts the application of the Consumer Contract Act, the Civil Code or any other mandatory law of Japan. Where you are a consumer within the meaning of the Consumer Contract Act, any part of these Terms that would wholly exclude our liability in damages, that would partially exclude our liability where we have acted intentionally or with gross negligence, or that is otherwise void under that Act, does not apply, and we remain liable in accordance with the law.
5. Nothing in this Section restricts, beyond the extent permitted by law, any statutory warranty or other liability we owe to consumers.

15. Apple

• These Terms are an agreement between you and us. Apple Inc. ("Apple") is not a party to them
• We, and not Apple, are responsible for providing the App
• Apple has no obligation to provide maintenance or support for the App. We handle enquiries about the App
• If the App fails to conform to any applicable warranty, you may notify Apple, and Apple may refund the purchase price of the App. To the maximum extent permitted by law, Apple has no other warranty obligation, and any other claims, losses, liabilities, damages, costs or expenses attributable to a failure to conform to a warranty are our responsibility
• We, and not Apple, are responsible to the extent required by law for addressing claims relating to product liability, failure to conform to consumer protection legislation, or infringement of third-party intellectual property rights
• You represent that you are not located in a country subject to a U.S. Government embargo and that you are not listed on any U.S. Government list of prohibited or restricted parties
• Apple and its subsidiaries are third-party beneficiaries of these Terms and, upon your acceptance of these Terms, have the right to enforce them against you

16. Changes to these Terms

• These Terms constitute standard terms of contract under Article 548-2 of the Civil Code of Japan. We may amend them under Article 548-4 where the amendment is in the general interest of users, or where the amendment does not conflict with the purpose of the contract and is reasonable in light of the necessity for it and the appropriateness of its content
• Amended Terms take effect from a stated date and will be notified in advance by publication on this page and by appropriate means such as an in-app notice. If you use the App on or after that date, you are deemed to have agreed to the amended Terms

17. Severability and language

• If any provision of these Terms is held void or unenforceable by law, the remaining provisions continue in full force. A provision held void or unenforceable is to be construed as replaced by the valid provision closest to its intent
• These Terms exist in a Japanese version and an English version. In the event of any discrepancy, the Japanese version prevails

18. Governing law and jurisdiction

• These Terms are governed by and construed in accordance with the laws of Japan
• Any dispute between us and you concerning the App or these Terms is subject to the exclusive jurisdiction of the Tokyo District Court as the court of first instance. However, where you are a consumer and the law provides for a different jurisdiction, that law applies

19. Company details

20. Contact

For questions about these Terms, please contact us.

Revot Co., Ltd.
Email: sukisaki@revot.jp

Terms of Use for Revot Co., Ltd. as a whole