Terms of Service

Article 1 (Application)

These Terms of Service are established for the purpose of defining the rights and obligations between users and the provider of Kokoro Diary (hereinafter "this app") regarding the use of this app, and shall apply to all relationships between users and the provider of this app related to the use of this app.

Article 2 (Definitions)

1. "User" means an individual who uses this app.
2. "Content" means diaries, images, and other information that users post through this app.
3. "AI Analysis" means functions such as emotion analysis and AI comment generation provided by this app.

Article 3 (User Registration)

1. Users shall agree to these Terms of Service and complete user registration when using this app.
2. User registration shall be conducted through authentication using Google accounts, Apple accounts, or email addresses and passwords.
3. Users shall promptly update their registered information within this app when there are changes to their registration details.
4. The provider of this app may refuse user registration if the applicant falls under any of the following circumstances:
   • If the applicant has previously violated these Terms of Service
   • Other cases where the provider of this app deems the user registration inappropriate

Article 4 (Usage Fees)

1. All features of this app can be used free of charge by viewing advertisements.
2. Subscribers can use all features without advertisements.
3. Billing shall be conducted through the App Store or Google Play.
4. Subscriptions are automatically renewed, and unless automatic renewal is stopped at least 24 hours before the end of the contract period, they will be automatically renewed for the same period.
5. Users can stop automatic renewal at any time from their App Store or Google Play account settings.

Article 5 (Prohibited Activities)

Users shall not engage in the following activities when using this app:

1. Activities that violate laws or public order and morals
2. Activities related to criminal acts
3. Activities that destroy or interfere with the functions of the provider's servers or networks
4. Activities that may interfere with the operation of this app
5. Activities that collect or accumulate personal information of other users
6. Activities that impersonate other users
7. Activities that directly or indirectly provide benefits to anti-social forces in connection with the provider's services
8. Other activities that the provider of this app deems inappropriate

Article 6 (Content Posting)

1. Users shall guarantee that they have the right to post content to this app and that they are not infringing on the rights of others.
2. Content posted by users shall grant the provider of this app the right to use it free of charge.
3. The provider of this app may retain content posted by users for the period specified by law when there are legal requirements for retention periods.

Article 7 (AI Analysis)

1. This app conducts emotion analysis using AI technology on content posted by users.
2. AI analysis results are for reference only and do not substitute for medical diagnosis or professional psychological counseling.
3. Users shall judge AI analysis results at their own responsibility and consult with specialists when necessary.

Article 8 (Data Handling)

1. This app manages data using Google Cloud Platform services such as Firebase Authentication, Firestore, Cloud Functions, and Cloud Storage.
2. The handling of users' personal information shall comply with the separately established Privacy Policy.
3. The provider of this app shall implement security measures to appropriately manage user data and prevent unauthorized access, leakage, tampering, and loss.

Article 9 (Notification Features)

1. This app sends push notifications using Firebase Cloud Messaging.
2. Users can manage notification reception through settings.
3. Permission for device notification settings is required to receive notifications.

Article 10 (Advertisements)

1. This app displays advertisements using Google AdMob and ironSource.
2. Subscription members can enjoy the benefit of ad-free viewing.

Article 11 (Intellectual Property Rights)

1. Intellectual property rights related to this app belong to the provider of this app.
2. Users shall have the right to use this app and shall not engage in activities that infringe on intellectual property rights related to this app.

Article 12 (Disclaimer)

1. The provider of this app shall not be liable for any damages arising from the use of this app.
2. The provider of this app shall not be liable for any damages arising from changes, suspension, or termination of this app.
3. The provider of this app does not guarantee the accuracy, completeness, usefulness, etc. of information obtained by users through the use of this app.

Article 13 (Changes to Service Content)

The provider of this app may change the content of this app or discontinue the provision of this app without notifying users, and shall not be liable for any damages arising therefrom.

Article 14 (Changes to Terms of Service)

The provider of this app may change these Terms of Service at any time without notifying users when deemed necessary. Continued use of this app after changes to these Terms of Service shall be deemed as agreement to the changed terms.

Article 15 (Notifications or Communications)

Notifications or communications between users and the provider of this app shall be conducted by methods established by the provider of this app. The provider of this app shall send notifications or communications to the currently registered contact information, which shall be deemed as having reached the user at the time of transmission, unless the user submits a change notification in accordance with the separately established method.

Article 16 (Prohibition of Assignment of Rights and Obligations)

Users may not assign their contractual status or rights or obligations under these Terms of Service to third parties or use them as collateral without the prior written consent of the provider of this app.

Article 17 (Governing Law and Jurisdiction)

1. Japanese law shall be the governing law for the interpretation of these Terms of Service.
2. In the event of disputes related to this app, the court having jurisdiction over the location of the provider's headquarters shall be the exclusive agreed jurisdiction.

Article 18 (Supplementary Provisions)

These Terms of Service shall take effect from July 3, 2025.

Contact Information

Kokoro Diary Operations Team

📧 support@knotnest.jp