Dohyo Girl! (2010)

Original title: 土俵ガール！

Hikari Kobayashi is trying to make it big as a model. Her father, who was a sumo wrestler, raised her like a boy, but she eventually resisted and severed her ties with sumo. When she accidentally ends up as a member of the school's dying sumo club, she takes on the role of the club's director in order to rebuild it.