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Privacy Policy

Information about how NIHONGO-AI handles personal data and privacy.

Last Updated: July 28, 2025

1. Basic Policy

We recognize the importance of users' personal information and strive to handle and protect it appropriately in compliance with the Personal Information Protection Act and other related laws and regulations.

2. Definition of Personal Information

In this Privacy Policy, personal information refers to personal information as defined in Article 2, Paragraph 1 of the Personal Information Protection Act, namely information about living individuals that can identify specific individuals through names, birth dates, and other descriptions contained in such information (including information that can be easily cross-referenced with other information to identify specific individuals).

3. Information We Collect

We may collect the following information:

3.1 Basic Information

  • Name, email address
  • Information provided when creating an account
  • Profile information

3.2 Payment Information

💳 About Payment Information Handling

  • • Stripe経由処理：Credit card information is not stored on our servers but is securely processed by PCI DSS-compliant Stripe Inc.
  • • 保存情報：We only store Stripe customer IDs, subscription information, and payment history
  • • セキュリティ：Payment data is protected using industry-standard encryption technology
  • • アクセス制限：Access to payment information is restricted to the minimum necessary personnel

3.3 Usage Information

  • Service usage history
  • Access logs, IP addresses
  • Device information, browser information
  • Technical information such as cookies

4. Purpose of Use of Personal Information

We use the collected personal information for the following purposes:

  • Service provision, operation, and improvement
  • User support and inquiry response
  • Billing and payment processing
  • Sending important notifications
  • Usage analysis and statistics creation
  • Security assurance and fraud prevention
  • Legal compliance

5. Third-Party Sharing

We do not provide personal information to third parties except in the following cases:

  • With user consent
  • When required by law
  • When necessary for the protection of life, body, or property
  • When providing to business partners necessary for service provision (under appropriate management)

5.1 Business Partners

Main business partners:

  • • Stripe Inc. - Payment processing service
  • • Google LLC - Authentication service (Google OAuth)
  • • Vercel Inc. - Hosting service
  • • Other cloud service providers - Infrastructure provision

6. International Data Transfer

To provide our services, personal information may be processed on servers located outside of your country (mainly in the United States). These countries may have different data protection regimes than Japan, but we will take appropriate security measures to protect your personal information.

7. Security Measures

We take the following measures for the proper management of personal information:

  • Organizational security measures: Establishment of a personal information protection officer, development of regulations
  • Human security measures: Implementation of education and training for employees
  • Physical security measures: Physical security of data centers
  • Technical security measures: Encryption, access control, firewalls, etc.

8. Cookies & Tracking Technologies

We use cookies to improve the convenience of our services. Cookie settings can be changed from your browser, but disabling them may limit some functions.

We use Google Analytics and Google Adsense to analyze site usage and serve advertisements. Please see below for details.

8.2 Google Analytics Usage

We use Google Analytics (GA4) to analyze site usage.

Data Collected

Google Analytics collects the following data:

  • Page views, visit counts
  • Session duration, bounce rate
  • Referrer URL, search keywords
  • Device information (model, OS, browser)
  • Geographic information (country, city level)
  • IP address (anonymized)

Purpose of Use

Collected data is used for the following purposes:

  • Analyzing site usage
  • Improving and optimizing content
  • Enhancing user experience
  • Measuring marketing effectiveness

Anonymization and Privacy Protection

Data collected by Google Analytics is protected through the following methods:

  • Automatic IP address anonymization
  • Exclusion of personally identifiable information
  • Control via Consent Management Platform (CMP)

Cookie Consent and Consent Mode

We use 'Consent Mode':

  • When cookies accepted: Detailed data collection
  • When cookies denied: Minimal anonymized data collection

Even if you deny cookies, anonymized data is collected, but cannot identify you personally.

Data Sharing

Collected data is shared with Google LLC. Please review Google's data processing:

Opt-Out (Refuse Data Collection)

To completely refuse Google Analytics data collection, you can opt-out using the following methods:

8.3 Google Adsense Usage

We use Google Adsense to serve advertisements.

Ad Serving Mechanism

Google Adsense uses the following information to serve ads:

  • Site content
  • User interests (when consented)
  • Browsing history (when consented)
  • Device information, geographic information

Personalized Advertising

Ad serving methods differ based on cookie consent status:

  • When accepted: Personalized ads based on interests
  • When denied: Non-personalized ads based on content

Data Sharing

For ad serving, the following information may be shared with Google LLC and advertising partners:

  • Cookie ID
  • Ad display and click information
  • Site visit information

For details, please refer to Google's Advertising Policy.

Opt-Out (Refuse Ad Customization)

To refuse personalized advertising:

9. User Rights

Users have the following rights regarding their personal information:

  • Request for disclosure, correction, or deletion
  • Request to stop usage or erase
  • Request to stop third-party sharing

To make these requests, please contact us at the address below. We will respond within a reasonable period after appropriate identity verification.

10. Data Retention Period

Personal information is retained for the period necessary to achieve the purpose of use and for the period stipulated by law. After account deletion, personal information will be deleted except for the period stipulated by law.

11. Changes to Privacy Policy

We may change this Privacy Policy from time to time. Important changes will be announced on our website in advance.

Contact

For questions or consultations regarding the handling of personal information, please contact us at:

Personal Information Protection Officer

Email: nihongo.ai.office@gmail.com

Phone: Please inquire via email