Privacy Policy

Established: March 5, 2026
Revised: October 6, 2026

This Privacy Policy explains how the website "Shigure no Hyakunin Isshu" (the "Site") handles personal information.

1. Information We Collect

The Site may collect information from users when they use certain features, such as the karuta game rankings, the word cloud, and the contact form.

The Site offers sign-in with a Google account for joining the karuta game rankings. When you sign in, we collect the following information:

• The display name of your Google account
• The email address of your Google account
• The profile image URL of your Google account

Only the nickname you set yourself is shown on the leaderboards (if you have not set one, you appear as "Anonymous"). We do not show your Google account's display name, email address, or profile image on the leaderboards, nor do we store them in the ranking database. You can change your nickname at any time while signed in, and the "Delete data" button deletes both your leaderboard records and the sign-in information stored by the authentication service (email address, display name, etc.).

Signing in is required only for joining the rankings. You can browse the Site and play the games without signing in.

The following features can be used without signing in, and collect the information below:

• Word cloud: the words you post (these are not linked to any information that identifies you)
• Contact form (Google Forms): the name, email address, and inquiry you enter. If a reply is needed, we may contact you at the email address you provided.

2. How We Use Information

We use the information we collect only for the following purposes:

• Verifying signed-in users and showing your own account on your screen while you are signed in
• Showing the nickname you set on the leaderboards
• Managing and tallying ranking data
• Responding to inquiries (including replies by email) and contacting you when necessary
• Improving our services and operating the Site

We will not use the information we collect for any other purpose.

3. Data Management and Disclosure to Third Parties

• Security: The Site uses Google Firebase (Authentication / Firestore / Realtime Database) to manage data. Google account information is stored in the authentication service (Authentication), and ranking records and word cloud posts are stored in the databases, on Google's servers with appropriate security measures.
• No disclosure to third parties: We will not provide personal information to third parties without your consent, except as required by law.

4. External Services and Analytics

• The Site uses Google Sign-In for authentication. Your use of it is subject to Google's Privacy Policy.
• The Site uses cookies to analyze usage, and browser storage (such as localStorage) to keep you signed in and to save things like your game progress. We use Google Analytics and Cloudflare Web Analytics for access analysis; this data does not include information that identifies individuals.
• You can refuse this data collection by disabling cookies in your browser settings.

5. Contact

For questions about this Policy, please contact us using the form below.

Contact Form

6. Changes to This Privacy Policy

We may change this Policy as necessary.
Any changes take effect when the revised Policy is posted on this page.

This is an English translation of the Japanese Privacy Policy. If there is any difference between the two, the Japanese version prevails.