Only the current version so far — new entries appear as the app ships updates.
ルーム231 - 放送大学生の勉強アプリ（非公式） is an education app by blazeworks with 1+ downloads (about 1 estimated). Install growth, rank history, SDKs and ad networks.
From the store listing: “A study app for Open University students. You can search for subjects by average score, and track and record your study time.”
