Akademi Highschool is an all girls school, every single girl who studies their are mean and naive, one day, a school shooting happened, fortunately everyone survived, but they we're all traumatized by the experience, Ms. Kim, the headmaster of Akademi, signed a contract with the military school out of town, and sent every teacher, student, and even herself to learn self defense

Ms. Kim: Everyone, line up, when i call your name, enter the bus...