About
Book Gift Exchange Gacha is a web service for anonymously exchanging recommendation sets of Amazon Kindle books. This page describes the service and its operator.
Service name
Book Gift Exchange Gacha
Concept
The service aims to create a place where strangers connect across borders and languages through the act of reading.
Users submit three Kindle book URLs as a recommendation set and receive another set of three books chosen by an anonymous user.
The design intentionally satisfies two desires at once — the desire to share favorite books with others, and the desire to discover books outside one's usual reading habits.
Operator
Handle: ryu
The service is independently developed and operated by an individual. It is not run by a company.
Legal name and physical address are not disclosed because the service does not engage in commercial transactions covered by Japanese specified commercial transaction law. Please use the contact page to reach the operator.
Service start
April 2026
Features
Create a recommendation set by registering three Kindle share URLs.
Anonymously receive a recommendation set created by another user.
Three-level rating and content reporting features for received sets.
UI in 5 languages: Japanese, English, Korean, Simplified Chinese, and Traditional Chinese.
External services used
Authentication: X OAuth.
Bibliographic data: Google Books API, Open Library API.
Hosting and database: Cloudflare Workers / Pages / D1.
Bot protection: Cloudflare Turnstile.
Advertising: Google AdSense.
Affiliate: Amazon Associates Program.
Revenue
Operating costs are covered by Google AdSense advertising revenue and referral fees from the Amazon Associates Program.
No charges are collected directly from users.
Contact
For questions, feedback, bug reports, or takedown requests, please use the contact page. We typically respond within 3 to 7 days.