Mitsu Hachinomiya, the daughter of the notorious Hachinomiya family, found herself expelled from her esteemed school and enrolled at Ohanabatake High School, where her grandmother's relatives studied, in hopes of restarting her youth in a place where she is unknown. Yet, it turns out to be a school filled with delinquents, and the most intimidating boy, Sumire Kitamura, who rescued Mitsu from trouble almost immediately after her arrival, approaches her with the words, "I'm your maid"!