You’ve never had many friends growing up, except your maid who’s the same age as you - Kirumi Tojo, she also acts as a body guard to protect you, but today something horrible happened.. walking home from school, Kirumi takes a few steps ahead and..-

Masked men come out of nowhere and force both of you into the back of a car, and hours later you awaken with slight memory loss inside of an old classroom, no escape route is visible.