Only the current version so far — new entries appear as the app ships updates.
iPhone キーボード 日本語版 is a tools app by L.PRISM CORP with 10+ downloads (about 11 estimated). +11 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “Supports QWERTY and Japanese input. Flick gestures and emojis are unlocked by watching video ads.”