Use APKPure App
Get Youkai old version APK for Android
핵심에서 Kitsu.io와 애니메이션과 만화 응용 프로그램 [WIP]
This is an app which is work in progress. It's not even usable right now. We are using the Play Store for testing.
The project on GitHub: https://github.com/youkai-app/Youkai