Magical Girl Sword

This is a slightly painful story about a sullen girl who uses her own ribs as a weapon to violently beat various irrational objects on a stage of destruction co-produced by a drama-loving otaku and a philosophical lunatic AI. This is the story of a gloomy girl who prayed devoutly in math class, "Destroy the world quickly." Her dream came true. This is, I don't know how to make it up, anyway this is a story