IQQI Keyboard is the best input method, supports Japanese
MUST KNOW：You need to install both this Japanese dictionary pack and IQQI Keyboard ( https://goo.gl/1M33eJ ) .
IQQI Keyboard is the best input method. It's free, fast, easy and fun !
♥ Supports 60+ languages
♥ Smart word prediction(Chinese, English, Arabic, Japanese, French and many other main languages )
♥ Personal Predictions
♥ User adjustable keyboard Height
♥ User adjustable and custom keyboard themes
♥ Emoji, Emoji Art, Emoticons (^.<) & Symbols (♪)
♥ Voice Input
♥ Text Editing Tools (↑↓←→、Cut、Copy、Paste、Tab)
♥ Instant Text
♥ Backup word dictionary to SD card, Dropbox, Google Drive.
♥ Import contact names