Chisato and Mahiro are two high school girls who are about to graduate. They also happen to both be highly skilled assassins and their organization has insisted that they properly integrate into "normal" society. When the organization they work for orders them to share a room, the relationship between the pair quickly turns sour. However, when they find themselves targeted by the yakuza, the girls quickly realize that they will have to find a way to work together in order to make it to normal society.