Pashiri na Boku to Koi suru Banchou-san

Unoki-kun, a boy who's been bullied since elementary school, ends up becoming the exclusive errand boy of the top delinquent of his school, Toramaru-san, who told him "Be mine" right after entering high school. But the truth is that Toramaru-san meant it as a confession of love!!
This is the beginning of a love misunderstanding between Toramaru-san, who thinks she's in a relationship, and Unoki-kun, who think he's being bullied.