Only the current version so far — new entries appear as the app ships updates.
ぬぬぬメール SMS/MMS/Eメールアプリ is a communication app by NetVision Co.,Ltd. Shizuoka Japan with 10,000+ downloads (about 10K estimated). Released Oct 25, 2016. Install growth, rank history, SDKs and ad networks.
From the store listing: “It is a message application that supports SMS / MMS. It also supports email.”