Effective Date: March 31, 2026
Last Updated: July 7, 2026
Grosbeak Inc. ("we," "us," or "our") operates the Amestella fortune-telling entertainment application ("the App"). This Privacy Policy explains how we collect, use, disclose, and safeguard your personal information when you use the App. Please read this policy carefully. By using the App, you consent to the practices described herein.
In this Privacy Policy, "personal information" means "personal information" as defined in Japan's Act on the Protection of Personal Information (information about a living individual that can identify a specific individual by name, date of birth, or other description, or that contains an individual identification code), as well as other information about an individual — such as an email address — that is used in connection with a specific individual.
| Item | Details |
|---|---|
| Company Name | Grosbeak Inc. (Grosbeak Kabushiki Kaisha) |
| Representative | Tomonori Hamada |
| Address | 8-2-6 Okidome, Ikaruga-cho, Ikoma-gun, Nara 636-0123, Japan |
| Contact | Inquiry Form |
| Data Item | Required/Optional | Purpose |
|---|---|---|
| Email address | Required | Account authentication, important notifications |
| Display name | Required | In-app user display |
| Profile photo | Optional | In-app user display |
| Phone number | Optional | Account authentication (phone sign-in) |
| Data Item | Required/Optional | Purpose |
|---|---|---|
| Date of birth | Required | Fortune calculations across multiple divination systems |
| Time of birth | Optional | Precise astrological calculations |
| Place of birth | Optional | Astrological house calculations |
| Latitude/Longitude | Optional | Celestial position calculations (auto-derived from birthplace) |
| Gender | Optional | Used in certain divination systems |
| Data Item | Required/Optional | Purpose |
|---|---|---|
| Pet name | Required | Pet fortune features |
| Pet type | Required | Pet fortune features |
| Breed | Optional | Pet fortune features |
| Pet date of birth | Required | Pet fortune calculations |
| Pet gender | Optional | Pet fortune features |
| Pet photo | Optional | In-app pet display |
| Pet birthplace | Optional | Pet fortune calculations |
| Data Item | Purpose |
|---|---|
| Subscription status | Billing management, service delivery |
| Pentacle balance | In-app currency management |
| Transaction history | Purchase and usage record keeping |
| Fortune results | Saving and displaying fortune history |
| Compatibility history | Saving and displaying compatibility results |
| FCM token | Push notification delivery |
| Data Item | Purpose |
|---|---|
| Device model, OS version, app version | Bug analysis, quality improvement, and customer support |
| Crash information (stack traces, etc.) | Detecting and fixing app defects (Firebase Crashlytics) |
| Performance information (startup time, network conditions, etc.) | Improving app quality and performance (Firebase Performance Monitoring) |
| Usage data (screen views, interaction events) | Analysis for service improvement (Firebase Analytics; collected with the user's consent) |
When you send an inquiry or feedback, your user ID, app version, OS version, and device model are passed to the inquiry form (Google Forms) — only to the extent you select with the checkboxes — so we can review your situation.
We use the information we collect for the following purposes:
Except as required by law or with your consent, we do not provide your personal information to third parties. However, to the extent necessary to provide the App's services, we entrust the handling of personal information to the following external service providers. Under Japan's Act on the Protection of Personal Information, this constitutes "entrustment," and these providers process personal information only within the scope of the entrusted purpose and in accordance with our instructions and agreements. We exercise necessary and appropriate supervision over these providers.
| Service | Data Shared | Purpose |
|---|---|---|
| Firebase Authentication | Email, display name, profile photo | User authentication |
| Cloud Firestore | User data, fortune results, pet data | Data storage and management |
| Firebase Cloud Storage | Profile photos, pet photos | Image file storage |
| Firebase Cloud Messaging | FCM token | Push notification delivery |
| Firebase App Check | Device information | Fraud prevention |
| Firebase Cloud Functions | Fortune calculation data | Server-side processing |
| Firebase Crashlytics | Crash information and device info (model / OS version / app version) | Detecting and fixing app defects |
| Firebase Performance Monitoring | Performance information and device info | Improving app quality and performance |
| Firebase Analytics | Usage data (screen views, events); collected with the user's consent | Analysis for service improvement |
Google Privacy Policy: https://policies.google.com/privacy
| Data Shared | Purpose |
|---|---|
| Date of birth, time of birth, gender (anonymized) | AI-generated fortune interpretations |
| Pet information (type, breed, date of birth) | AI-generated pet fortune interpretations |
Data is sent to Google Gemini AI API through Cloud Functions (server-side) only. Your name, email address, and other directly identifying information are not transmitted to the AI service.
Google AI Privacy Notice: https://ai.google.dev/terms
| Data Shared | Purpose |
|---|---|
| User ID (anonymous identifier) | Subscription and purchase management |
| Purchase information (Apple receipt, Google purchase token, last seen time, device type and OS) | Purchase verification and management |
RevenueCat, Inc. is located in the United States, and the data shared is stored and processed in the United States (e.g., on Amazon Web Services). RevenueCat acts as our service provider (data processor), processing the data only on our documented instructions, and does not sell or share it (it qualifies as a "Service Provider" under the California Consumer Privacy Act (CCPA)). To provide its services, RevenueCat may use sub-processors located in the United States (including Amazon Web Services, Snowflake, Google LLC, OpenAI, and Anthropic). We do not transmit sensitive information such as your date of birth, place of birth, location data, or fortune-telling results to RevenueCat.
| Data Shared | Purpose |
|---|---|
| Place of birth (location name) | Geocoding (converting place names to coordinates) |
| Provider | Data Shared | Purpose |
|---|---|---|
| Google Sign-In (Google LLC) | Authentication tokens | Account authentication |
| Sign in with Apple (Apple Inc.) | Authentication tokens | Account authentication |
| Data Shared | Purpose |
|---|---|
| User ID, app version, OS version, device model (to the extent you select) | Responding to inquiries and feedback; reviewing your situation |
Our inquiry form and feedback box are provided via Google Forms, and submissions are processed on Google LLC's servers (United States). You can choose which information to include using checkboxes and review it before sending.
We do not sell, rent, or trade your personal information to third parties for their marketing purposes. Under the California Consumer Privacy Act (CCPA), we confirm that we have not sold personal information of consumers in the preceding 12 months.
Your personal information is stored on Google Cloud Platform (Firebase) servers, primarily in the Tokyo region (asia-northeast1), Japan.
| Data Type | Retention Period |
|---|---|
| Account information | Until account deletion |
| Fortune results and compatibility history | Until account deletion |
| Pet information | Until account deletion |
| Transaction history | Until account deletion, or as required by law (up to 5 years) |
| Push notification tokens | Until account deletion |
Some of the third-party service providers we use are located outside Japan. In particular, subscription and purchase data shared with RevenueCat, Inc., as well as data handled by Google LLC and Apple Inc., is transferred to and processed in the United States. If you are located outside Japan, your information may also be transferred to and processed in Japan. By using the App, you consent to these international transfers. We ensure that appropriate safeguards (such as Standard Contractual Clauses and Data Processing Addenda) are in place to protect your data in compliance with applicable data protection laws.
If you are located in Japan, you have the right to:
If you are located in the European Economic Area (EEA), you have the following additional rights:
To exercise these rights, please contact us through our inquiry form.
If you are a California resident, you have the following rights:
To submit a CCPA request, please contact us through our inquiry form.
The iOS and Android versions of the App do not use cookies. However, Firebase SDK may use device identifiers for functionality purposes.
The App uses Firebase Analytics (Google Analytics for Firebase) to collect and analyze usage data such as screen views and interaction events. This information is collected based on the user's consent and is used solely to improve the App. You may change (turn off) your consent to usage analytics at any time from the "User Settings" screen within the App. For details on the information collected, please also refer to "2.5 Device and Diagnostic Information" and "4.1 Firebase" above.
We implement the following security measures to protect your personal information:
In addition to the technical measures above, we designate a person responsible for the handling of personal information, provide necessary and appropriate supervision of our employees regarding the proper handling of personal information, and — where we entrust all or part of the handling of personal information to external contractors — exercise necessary and appropriate supervision over those contractors so that they manage personal information securely.
While we strive to protect your personal information, no method of transmission over the Internet or electronic storage is 100% secure. We cannot guarantee absolute security.
If you are in the EEA, our legal basis for collecting and using your personal information depends on the data concerned and the context in which we collect it:
| Legal Basis | Applicable Processing |
|---|---|
| Consent | Collection of birth data for fortune calculations; push notifications |
| Contract Performance | Account management; subscription services; in-app purchases |
| Legitimate Interests | Service improvement; fraud prevention; security |
| Legal Obligation | Tax and financial record keeping; responding to legal requests |
If you have questions or concerns about this Privacy Policy or our data practices, please contact us at:
| Item | Details |
|---|---|
| Company Name | Grosbeak Inc. |
| Data Protection Contact | Tomonori Hamada |
| Contact | Inquiry Form |
After you submit the inquiry form, we will review your message and respond in turn (excluding weekends and Japanese public holidays).
Effective: March 31, 2026
Grosbeak Inc.
Representative Director: Tomonori Hamada