I is a university, who came to Tokyo from his hometown. I lives alone and doesn't have friends or a girlfriend. I's university life is boring and he doesn't have a dream. I supports himself by working as a day laborer at a construction site. I meets two people at a hide-and-seek club. One is his Senior and the other person is Black Suit. By meeting them, I's boring life changes. They start the "Midnight Maiden War," which is their plan to destroy Tokyo.