Ｋｎｏｃｋ　Ｏｕｔ－対戦型脱衣麻雀－

Train yourself by playing mahjong with teachers and move on to defeat girls in strip mahjong.

Based on characters from a "Shijou Saikyou no Deshi Ken'ichi" manga, which was later adapted to anime.
[Edited from vndbreview]