Bakuchinugi!

The story of "Bakuchinugi!" begins when the younger sister of the incredibly lucky high school boy Nanase Kiseki loses in a strip gambling game and has her underwear stolen. There is a rumor that the culprit who stole his sister's underwear is targeting beautiful gamblers, so Kiseki cross-dresses and joins the gambling club, which is full of girls. (Source: Natalie, translated)