Use APKPure App
Get Japanese IME 136 old version APK for Android
Japanese IME 136 for Android is based OpenWnn 1.3.6
This IME app is Discontinued .
But [Japanese IME 136 Plus] is still Active and also Free !
Please install below .
https://play.google.com/store/apps/details?id=jp.ne.neko.freewing.OpenWnn136Plus