Only the current version so far — new entries appear as the app ships updates.
NX!メール is a communication app by FCNT LLC with 500,000+ downloads (about 537K estimated). +15 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “NX! Mail is a mail app made by FCNT. It provides an intuitive operation and an easy-to-read and easy-to-understand user interface.”