Terms of Service

1. These terms apply to all services provided by NIHONGO-AI (the 'Company') (the 'Service').

2. 'Users' refers to all individuals or entities using this service.

3. 'Content' refers to all information including text, images, audio, video, programs, etc.

4. If you cannot agree to these terms, please stop using this service immediately.

1. If you are a minor, please use this service only after obtaining consent from your parent or guardian.

2. Users under 13 years of age may only use this service under the supervision of a parent or guardian.

3. We do not intentionally collect personal information from individuals under 13 years of age.

1. Registration is completed only when approved by the Company, and we have no obligation to explain approval decisions.

2. We will refuse or delete registration in the following cases:

• Providing false information
• History of terms violations
• Connection to antisocial forces
• Other cases deemed inappropriate by the Company

3. Account management is entirely the user's responsibility, and we will not compensate for damages from unauthorized use.

1. If we change our pricing structure, we will notify users at least 30 days in advance through an announcement on the service or by notification to the registered email address.

2. In principle, refunds will not be issued after payment is completed. However, if it is confirmed that an incorrect charge was caused by our system, we will appropriately issue a refund or adjustment.

3. When we receive inquiries regarding billing errors or duplicate charges, we will promptly conduct an investigation. If it is confirmed that an incorrect charge was caused by our system, we will appropriately issue a refund or adjustment. For issues originating from the payment service provider (Stripe), we will provide appropriate guidance, such as connecting you to Stripe's support.

4. In the event of payment delays or failures, we may temporarily suspend the service after notifying the user.

5. All taxes and fees are the responsibility of the user.

This service utilizes third-party services including payment processing (Stripe), database (Supabase), AI processing (Google Gemini), and hosting (Vercel).

In the event of failures, errors, data loss, or other issues caused by these third-party services, we will promptly conduct an investigation and respond appropriately if it is confirmed that the issue was caused by our system.

For issues specific to third-party services, we will provide appropriate responses such as guidance to each service's support. The terms of service and SLAs of each third-party service apply.

1. All intellectual property rights of this service belong to the Company; users are only granted usage rights.

2. Copying, reproducing, or secondary use of content is prohibited except for personal learning purposes.

3. Legal action and damage claims will be pursued for violations.

4. We own rights to AI-generated content, and commercial use is prohibited.

5. AI-generated content is provided for reference only and does not guarantee accuracy or completeness. Please always consult with experts for important decisions.

1. User data handling is defined in our separate Privacy Policy.

2. Responsibility for data loss or leaks is limited to legal minimums; emotional damages are not compensated.

3. No data recovery will be performed upon account deletion.

4. Backing up learning history and settings is the user's responsibility.

1. Users may cancel at any time, but no refunds for paid periods.

2. We may terminate the service with 30 days' notice only when there are reasonable grounds.

3. In cases of serious violations of the terms of service, we will immediately suspend or delete the account. For other violations, we will provide a warning in advance and offer an opportunity for improvement.

4. No data recovery or refund requests will be honored after deletion.

1. We may modify these terms when there are reasonable grounds. For significant changes, we will notify users at least 30 days in advance.

2. For significant changes, we will provide notification to the registered email address in addition to announcements on the site.

3. Changes can be reviewed on this service. If you do not agree with the changes, you may choose to discontinue use. Continued use after notification will be deemed as acceptance of the changes.

1. If any part of these terms becomes invalid, the effectiveness of other provisions is maintained.

2. Japanese law governs these terms, and Chiba District Court has exclusive jurisdiction.

3. International disputes will also be resolved exclusively under Japanese law and Japanese courts.

4. If these terms are provided in multiple languages, the Japanese version shall be the official version, and in the event of any discrepancies with other language versions, the Japanese version shall prevail.

This service is a learning support tool. Please use the information and features provided for reference only and always verify the content with a critical perspective.

Since the accuracy of AI functions, translation functions, and other features is not perfect, we strongly recommend consulting multiple sources of information and seeking advice from experts for important decisions.

Learning outcomes depend heavily on individual effort, ability, and environment, so the desired results may not be achieved solely through the use of this service.

For inquiries regarding these terms, please contact us at the following: nihongo.ai.office@gmail.com