Kaichou, Kannami-san ga Hen desu

A Twin Body-Swapping BL! Seikain Academy is an institution for the children of the elite. Amongst its students are twins Ouri and Himeri, who differ from each other in every way imaginable. The eldest twin, Ouri, is a listless member of the soccer club, while his younger sister, Himeri, is on the honor roll and serves as an assistant to the student council. Suddenly, a twist of fate causes them to switch bodies. In order to switch back, Ouri must seduce Tsukasa Houdou—the student council president—while in his sister's body! Meanwhile, Himeri discovers her brother's secret crush...? (Source: Libre, translated)