伊庭 茜

One of the three presidents of the Kitakoji Academy Student Association. She is the stepsister of the main character. She is a hard-working, serious and stoic person. An exemplary honor student. She is a model honor student and strongly admires Wakana, and together they are in charge of enforcing public morals in order to make the school a better place to live. She is strict with the protagonist, who is sloppy, but tries to get him to be decent as a member of her family.