Goripuri!

Otome-chan is called the "gorilla woman", she's a very strong girl. A boy, one day, going to her school saw her beating up another boy… Kanoyoma is a weak boy who tries to protect her, she begins to like him, but she is only willing to go out with a strong boy who protects her. Kanoyoma confesses to her that when they were kids, he swore to protect her. Now that they are in trouble, in a fight, Kanoyoma's personality changes to take care of her. His other self is willing to make Kanoyoma's weak boy disappear.