Handling of Personal Data
RYURAKU — Established: October 18, 2026
Fuji Bit Inc. ("we") handles information in the mobile application RYURAKU ("the app") as described below, in compliance with the Act on the Protection of Personal Information and other laws. This page organizes the contents of the Privacy Policy by each kind of information.
The app has no account registration or sign-in and does not obtain your name, email address, phone number, address, precise location (GPS), contacts or photos. We do not operate servers and do not collect or store your information on any server of ours.
1. Business operator
Fuji Bit Inc.
2. Information handled and purposes
| Information | Purpose | Recipient / storage | Retention |
|---|---|---|---|
| Advertising identifier (IDFA on iOS / advertising ID on Android) | Ad delivery, measurement, frequency capping, fraud prevention. On iOS used only if you allow tracking | Sent directly by the SDK to Pangle (Bytedance Pte. Ltd., Singapore) | Per Pangle's policy |
| IP address and device information (model, OS, language, screen size, etc.) | Ad delivery and optimization, estimating approximate region | Sent directly by the SDK to Pangle | Per Pangle's policy |
| Ad interactions (impressions, clicks) and SDK diagnostics | Ad measurement, frequency capping, fraud prevention | Sent directly by the SDK to Pangle | Per Pangle's policy |
| Theme setting (light / dark) | Keeping your display setting | On your device only (never sent) | Until you delete the app |
| Personalized-ads choice (allow / don't allow) | Telling the ad SDK whether ads may be personalized | On your device only (never sent; excluded from Android backup and device transfer) | Until you delete the app |
Simulation parameters are held temporarily on the device and are discarded when the app closes.
3. Provision to third parties
We do not sell your information. As shown above, Pangle obtains information through the SDK embedded in the app to the extent needed for ad delivery. Except where required by law, we do not provide information to any other third party.
4. Provision to third parties abroad
Bytedance Pte. Ltd., which operates Pangle, is a company in Singapore. For its data protection practices, see the Pangle Privacy Policy.
5. How to stop the sending of information
- Personalized ads (Android): choose "Don't allow" on the screen shown at first launch, before the ad SDK starts, to see non-personalized ads. The ad SDK does not start until you answer. Change it any time from "About this app" > "Ad settings". The choice is stored only on the device and excluded from Android backup and device transfer.
- Tracking (iOS): choose "Ask App Not to Track" in the dialog shown after launch (the ad SDK does not start until you answer). The IDFA is then not used and non-personalized ads are shown. You can change this later in Settings > Privacy & Security > Tracking.
- Personalized ads (iOS): choose "Don't allow" in "About this app" > "Ad settings" to turn off personalized ads even when tracking is allowed.
- Advertising ID (Android): reset or delete it from Settings > Privacy > Ads (on some devices Settings > Google > Ads).
- All sending: after you uninstall the app, nothing is sent.
6. Security measures
By not storing your information on servers, we minimize the risk of leaks. The only things stored on the device are the theme setting and the personalized-ads choice, and neither is sent anywhere. We use the official ad SDK from a trusted source and keep it updated, and we restrict access to the devices and accounts used to develop and operate the app.
7. Requests for disclosure, correction, deletion or suspension
Because we hold none of your information, there is in principle no data subject to disclosure, correction or deletion. For any request or question, please email the contact below; we will respond without delay in accordance with the law. For information obtained by Pangle, please contact Pangle via the Pangle Privacy Policy above. You can stop the use of your advertising identifier at any time as described in section 5.
8. Contact
Fuji Bit Inc.
support@fujibit.com