Chise Umenomori

Chise Umenomori is the heiress of the Umenomori family and a high school student the same age as Fumino and Takumi despite looking much younger. Lonely because her parents are rarely home, she creates a club and forcefully recruits Takumi and his friends in hopes of having people around her. She frequently clashes with Fumino and appears to have strong feelings for Takumi, who treats her normally rather than deferring to her status.