Only the current version so far — new entries appear as the app ships updates.
フラッシュカード単語帳 is an education app by Pao@Office with 1+ downloads (about 1 estimated). Install growth, rank history, SDKs and ad networks.
From the store listing: “A vocabulary app that lets you learn words quickly with pronunciation-enabled cards - Features a database of 3300 English words, as well as Thai and Korean words. Easily import words and memorization targets from Excel/CSV.”