Ore no Dankon♡Sacrifice

In order to help pay his family's 4-billion-yen debt, he was forced by a "rich and powerful old pervert who loves romantic comedies too much" to dress up as a woman and go to an all-girls' school. He is confused by the situation at first, but fortunately, the members of the student council are also men who were forced to join the all-girls school under similar circumstances. Can he survive school life in spite of the perverted old man's fetish for romantic comedy shenanigans⁉

(Source: Yanmaga, translated)