Используйте приложение APKPure
Историческую версию Japanese Keyboard Editor можно получить на Android
Простой редактор клавиатуры на японском языке для ввода японских алфавитов.
A simple editor to type in Japanese language. Typed text can be copied to other applications. A predictive suggestion is provided as the user types letters. This application helps learners who are learning the language to type and understand the language.