Two high school girls who are about to graduate also happen to be highly-skilled assassins. When the organization that employs them orders them to share a room, their relationship turns sour.
Chisato and Mahiro must pay four years of overdue fees or lose their membership in their assassin guild. They take part-time jobs, but find themselves in the middle of an armed robbery and being hunted by other assassins.
Gundala, who has grown up on the streets, must choose between continuing to look out for himself or doing something about the injustice that surrounds him.