Handling of Personal Information
CHIRAKU — Established: October 20, 2026
Fuji Bit Inc. ("we") handles information in the mobile application "CHIRAKU" (the "App") in compliance with Japan's Act on the Protection of Personal Information (the "APPI") and other applicable laws, as described below. This page organizes the contents of our Privacy Policy by type of information.
The App has no account registration or sign-in and no fields for entering personal information. It does not collect your name, email address, phone number, postal address, precise location (GPS), contacts or photos. We do not operate any servers, and we do not collect or store your information on servers of our own. The only things the App stores on your device are your theme setting and your personalized-ads choice.
However, to keep the App free, it includes the SDK (PAG SDK) of the advertising service "Pangle", and this SDK sends personally related information such as advertising identifiers, IP address and device information to Pangle. The details are described below.
1. Business operator
Fuji Bit Inc.
2. Information handled and purposes of use
| Information | Purpose | Recipient / where stored | Retention |
|---|---|---|---|
| Advertising identifiers (IDFA on iOS / Advertising ID on Android) and ad IDs issued by the ad SDK | Ad delivery, measurement, frequency capping (limiting how often the same ad is shown) and fraud prevention. On iOS, the IDFA is 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 your approximate region | Sent directly by the SDK to Pangle | Per Pangle's policy |
| Ad impressions, clicks and other interactions; SDK diagnostic information | Ad measurement, frequency capping and 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 the App is deleted |
| Personalized-ads choice (allow / don't allow) | Telling the ad SDK whether ads may be personalized | On your device only (never sent; on Android, excluded from backups and device-to-device transfer) | Until the App is deleted |
| Your email address, name (if given) and message when you contact us | Replying to your inquiry and investigating problems | Our email inbox (only if you email us) | Deleted once the inquiry is resolved and no longer needed |
Simulation progress, speed and similar settings are kept only temporarily on your device and are discarded when the App closes. We do not handle information beyond what is necessary for the purposes above.
3. Provision to third parties
We do not sell your information. As shown above, Pangle (operated by Bytedance Pte. Ltd.) obtains information directly through the SDK built into the App, to the extent necessary to deliver ads. We do not receive this information. Personal information received through inquiries is never provided to third parties. Except as required by law, we do not provide information to any other third party.
4. Provision to third parties in foreign countries
When you use the App, the advertising information listed in section 2 is sent to the following business outside Japan (APPI Articles 28 and 31).
| Recipient | Country | Information provided | Recipient's handling |
|---|---|---|---|
| Bytedance Pte. Ltd. (operator of the Pangle ad service) | Singapore (according to its privacy policy, its servers are located in the United States and Singapore, and data may be processed in countries where its group companies operate) | Advertising identifiers, IP address, device information, ad interactions, SDK diagnostic information | Pangle Privacy Policy |
Personal information protection systems in the recipient's countries
- Singapore: the Personal Data Protection Act 2012 (PDPA), administered by the Personal Data Protection Commission (PDPC).
- United States: there is no comprehensive federal privacy law; personal information is protected by sector-specific federal laws and by state laws such as the California Consumer Privacy Act.
For details of each country's system, see the "Survey of Personal Information Protection Systems in Foreign Countries" published on the website of Japan's Personal Information Protection Commission (https://www.ppc.go.jp/en/). The measures the recipient takes to protect personal information are described in the Pangle Privacy Policy linked above.
5. How to stop information from being sent
Tracking (iOS): In the iOS tracking permission dialog (App Tracking Transparency) shown after launch — the ad SDK does not start until you answer — choose "Ask App Not to Track". The IDFA will not be used and non-personalized ads will be shown. You can change this later in Settings > Privacy & Security > Tracking.
Personalized ads (iOS): Choose "Don't allow" under "About this app" > "Ad settings" in the App to turn off personalized ads even if tracking is allowed (allowed by default).
Personalized ads (Android): On first launch, before the ad SDK starts, the App asks whether ads may be personalized. Choose "Don't allow" to see non-personalized ads. The ad SDK does not start, and nothing is sent to Pangle, until you answer. You can change your choice at any time under "About this app" > "Ad settings". The choice is stored only on your device and is excluded from Android backups and device-to-device transfer, so a new device will ask again.
Advertising ID (Android): You can reset or delete your Advertising ID in Settings > Privacy > Ads (or Settings > Google > Ads, depending on the device).
All transmission: Once you uninstall the App, nothing more is sent.
6. Security measures
We minimize the risk of leaks by not storing your information on any server. The only data stored on your device are your theme setting and your personalized-ads choice, and neither is sent anywhere. We use the official ad SDK obtained from a trusted source and keep it up to date. Inquiry emails are kept in an email account with restricted access. We also take necessary measures, such as access restrictions, for the devices and accounts used to develop and operate the App. Because information is sent to a business outside Japan, we handle it with an understanding of the personal information protection system of that country (see section 4).
7. Retention period
- Data on your device (theme setting and personalized-ads choice): deleted when you uninstall the App.
- Information obtained by Pangle: retained for the period set out in the Pangle Privacy Policy.
- Personal information received through inquiries: deleted once the inquiry is resolved and no longer needed.
8. Requests for disclosure, correction, deletion or suspension of use
The only personal data we hold is what we receive through inquiries. To request notification of the purpose of use, disclosure (including records of provision to third parties), correction, addition, deletion, suspension of use, erasure or suspension of provision to third parties, please email the contact below with the subject "Personal information request". After confirming that the request comes from the email address you used to contact us, we will respond without delay in accordance with the law, in principle by email. There is no fee.
We do not hold information obtained by Pangle and therefore cannot disclose or delete it; please contact Pangle through the contact listed in the Pangle Privacy Policy. You can stop the use of advertising identifiers at any time by the methods in section 5.
9. Contact
For questions, complaints or consultations about the handling of personal information, please contact:
Fuji Bit Inc.
support@fujibit.com
10. Changes to this page
We may revise this page in response to changes in law or in the App's features. Revisions take effect when posted on this page.