Privacy 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.

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).

We may collect the following 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

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)

This service uses the Google Gemini API to provide Japanese language learning support features.

• Text entered by users is transmitted to the Google Gemini API for analysis and correction.
• The Gemini API processes the input data and generates analysis results.
• After the request is completed, the input data is not retained on the Gemini API side.
• User input data will not be used for AI model training.

For more details, please refer to the Google Cloud Privacy Policy. Google Cloud Privacy Notice

We process personal information based on the following legal grounds (for EEA/UK residents):

• Performance of Contract: For service provision, account management, and payment processing
• Consent: For cookie usage, marketing communications, and voluntary information provision
• Legitimate Interest: For service improvement, security assurance, and fraud prevention
• Legal Obligation: For retention and disclosure of information as required by law

In this service, personal information may be processed on servers in the following countries and regions to provide the service.

• United States: Google LLC (authentication, AI, analytics, advertising), Stripe, Inc. (payments), Vercel Inc. (hosting), Upstash Inc. (rate limiting)
• Australia: Supabase Inc. (database)

These countries may have different personal information protection systems than Japan, but we will protect personal information by implementing appropriate safeguards such as Standard Contractual Clauses (SCCs).

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.

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.

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

We use Google Adsense to serve advertisements.

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.

Personal information will be retained for the period necessary to achieve the purpose of use and for the period stipulated by laws and regulations.

• Account Information: Until account deletion (deleted within 30 days after deletion)
• Usage Logs: Up to 12 months
• Payment Records: Legal retention period (7 years)
• AI Input Data: Immediately discarded after request completion
• Cookies: In accordance with each cookie's retention period (refer to Cookie Policy)

We do not intentionally collect personal information from children under the age of 13.

In the EEA (European Economic Area), parental consent is required for the processing of personal information of individuals under the age of 16.

If we become aware that personal information from a child under 13 has been collected in error, we will delete it promptly.

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

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