Privacy Policy
Last updated: April 27, 2026
Kojinius ("we", "us") provides the calendar management service "KALENEX" ("the Service"). We are committed to respecting your privacy and appropriately protecting your personal information. This policy explains what information we collect, how we use it, and how we protect it.
1. Information We Collect
1-1. Account Information
When you sign in to the Service via your Google account, we obtain the following information:
- Email address
- Display name
- Profile image URL
1-2. Chatwork Integration (Optional)
If you choose to connect Chatwork, we obtain your Chatwork API token. The token is encrypted with AES-256-GCM before storage and is used only for sending notifications and messages. This integration is optional and can be disconnected at any time from the Settings page.
1-4. Business Data
We collect and store the following data as part of your use of the Service:
- Calendar events (title, date/time, location, description)
- Task information (title, description, priority, due date)
- Attached files (images, documents, videos attached to events, tasks, reports, etc.)
1-5. Usage Logs
We may collect access logs (IP address, User-Agent, timestamp) for service quality improvement and incident response.
1-6. Audit Logs
System administrators (admin / manager roles) record business events (login, file operations, plan changes, MCP integration, etc.) as audit_logs for operational auditing, anomaly detection, and support purposes.
- Items collected: actor information (uid / email / display name / role / team affiliations), action type (AuditAction), target resource (task / event / file / integration, etc.), IP address, User-Agent, timestamp
- Purpose: Detecting unauthorized access, supporting customer inquiries, and preserving compliance audit evidence
- Retention period: 90 days (auto-deleted by Firestore TTL policy)
- Third-party disclosure: None as a rule. Only in response to formal law-enforcement requests in accordance with applicable law
2. Purpose of Use
We use the collected information solely for the following purposes:
- Account authentication and identification
- Providing calendar and task management features
- Sending task notifications via Chatwork (connected users only)
- Service quality improvement and incident response
- Responding to terms of service violations
We will never sell or provide your information to third parties.
3. Third-Party Services
The Service uses the following third-party services. Please also review their respective privacy policies.
Google Firebase
Authentication, database, hosting
Chatwork
Notification messaging (when connected)
Anthropic Claude API
AI task priority analysis (when used)
4. Security
We implement the following security measures to protect your data:
- HTTPS (TLS) encryption for all communications
- AES-256-GCM encrypted storage of OAuth and API tokens
- Data access control via Firebase Security Rules
- Session management via Firebase Authentication
- CSRF protection (HMAC-SHA256 signed OAuth state parameter)
5. Data Storage & Deletion
Storage Location
All data is stored on Google Firebase (data centers in Japan or East Asia regions).
Disconnecting Integrations
When you disconnect Chatwork, any stored API tokens are immediately deleted. You can disconnect from the Settings page.
Account Deletion
If you wish to delete your account, please contact us using the information below. We will delete all personal data within 30 days of receiving your request.
6. Cookies & Local Storage
The Service uses cookies and browser local storage to maintain authentication sessions and save user preferences. We do not use cookies for advertising purposes.
7. Children's Privacy
The Service is not intended for children under the age of 13, and we do not knowingly collect personal information from children under 13.
8. Changes to This Policy
If we make changes to this policy, we will notify you on this page. For significant changes, we will provide in-app notifications or email notifications. Your continued use of the Service after changes constitutes acceptance of the updated policy.
9. Contact Us
For questions about this policy or requests for data deletion, please contact us at: