Asterism Works日本語Enzin Privacy Policy
This Privacy Policy explains how Asterism Works (operator: Yasuhiko Yamamoto (address disclosed without delay upon request); “we,” “us”) handles information in Enzin, our team-management app (the “App”). When we offer paid plans, we will publish a separate disclosure required by Japan’s Act on Specified Commercial Transactions.
1. Our approach
The App is designed to hold as little personal information as possible. Each team owns the information it registers. Except as necessary to provide the service, investigate bugs or abuse, or comply with law, we do not view or use the contents of a team’s data. If we view contents for support, we notify the team representative in advance and keep a record.
2. Information we collect
| Information | Details | Purpose |
|---|---|---|
| Login ID | An identifier issued by Apple, Google, or LINE (we do not receive email addresses or phone numbers, and do not store them if we do) | Identity verification and login |
| Display name | Display name of a guardian, coach, or player (a nickname is fine) | Display within a team |
| Player information | Display name, jersey number, and school year (optional; numbers only) | Roster, records, and attendance |
| Attendance, carpools, and duties | Attendance, vehicle availability and capacity, vehicle nickname and type (such as minivan; not addresses), and optional notes of up to 200 characters | Schedule, carpool, and duty coordination |
| Match records | Scores, play records, and an identifier for the device that entered the record | Scoring, analysis, and viewing |
| Video | Match videos recorded by a team (a stored copy that can be downloaded) | Match review |
| Payment contact | Email address of a representative applying for a paid plan; Stripe handles payment and we do not receive card details | Billing and receipts |
| Notification destination | Device notification identifier (the destination for push notifications; notification text does not include player names) | Notices and deadline alerts |
| Coach notes | Stored encrypted on the device; we cannot read them | Coaching notes |
We do not collect addresses, dates of birth, school names, photographs (other than video), phonetic spellings, or location information.
3. YouTube connection (use of YouTube API Services)
If a team chooses to do so, the App connects with its YouTube channel using YouTube API Services.
- Scope and data received: We use
youtube.force-sslto receive the connected channel name, connection authorization information, and IDs of streams and videos that we create or manage. We use them to create live-stream events and send video, upload match videos as unlisted, and display the connected channel name. - We store encrypted authorization information for the connection, the channel ID, and IDs for created streams and videos.
- Our use and transfer to any other app of information received from Google APIs will adhere to the Google API Services User Data Policy, including the Limited Use requirements. We use this data only to provide and improve the user-facing features of the App and do not use it for advertising. No human reads it except with your consent, where necessary to investigate a bug or abuse, or where required by law.
- By using the App’s YouTube connection, you agree to be bound by the YouTube Terms of Service (https://www.youtube.com/t/terms).
- For how YouTube (Google) handles information, see the Google Privacy Policy.
- You can disconnect at any time in the App settings using “Disconnect YouTube,” or revoke the App’s access in your Google security settings (https://myaccount.google.com/permissions).
- When a connection is disconnected, or when we learn that Google has revoked authorization, we delete stored authorization information within 7 days. Of the information obtained from YouTube, video IDs, stream IDs, and channel IDs are an exception: we retain them until the team is deleted so the team can view its videos in the App. We keep no other information obtained from YouTube for more than 30 days.
4. Service providers and connections
| Provider | Purpose |
|---|---|
| Cloudflare, Inc. | Server, database, and video-copy storage |
| Apple, Google, and LINE | Login |
| Google (YouTube) | Connected team streams and videos |
| Stripe | Paid-plan payments |
| Expo (650 Industries) | Delivery of device notifications |
Our service providers may store or process information outside Japan, including in the United States.
5. Who can see information
- Team information is visible only to members of the team. Viewers using a viewing link see player information with player names hidden.
- Information about players linked to fouls or injuries is not shown to guardians or through a viewing link.
- Information that records mistakes by player is visible only to people with coach permission.
6. Retention and deletion
- Video copies are automatically deleted after the retention period stated for the applicable plan on the pricing page. Videos on YouTube are managed by the team and are not affected by this automatic deletion.
- When team deletion is requested, we delete all information for that team after a seven-day cancellation period. We retain only a deletion record: team number, date and time, and count.
- You can start account deletion in the App settings. When account deletion is requested, we delete information for that account after a seven-day cancellation period.
- We retain payment records as required by law. Information remaining in backups is deleted within 30 days.
7. Children’s information
The App is intended for youth sports teams but is not intended for use by children under 13 on their own. Only a guardian or team representative registers information about a player (a child). A guardian may ask the team representative or us (support@asterism-works.com) to review, correct, or delete their child’s information. Before recording or streaming video, the team must obtain consent from the guardian of each player who appears. The App can record that consent.
8. Logs, safeguards, and your rights
We retain server access logs (such as IP address and device type) for 90 days to investigate failures and prevent abuse. We use safeguards including encryption in transit, access controls, and permission management. To request access to, correction, deletion, or suspension of use of your information or your child’s information, contact support@asterism-works.com. We will respond after confirming your identity or parental authority.
9. Contact
Asterism Works support@asterism-works.com
10. Changes
We will give notice of material changes in the App or on this page at least 14 days before they take effect.
Effective date: 2026-10-28