The plot takes place in the year 2039, when an assassination group known as Snakes gets renown by executing difficult acts and spreading their brand around the world, and a young woman approaches them to kill her. Snakes grant her request and dispatch a top assassin, Nirva, to do the job, but things take an unexpected turn when he falls in love with her. Why did he fall in love with her? What exactly are snakes? What made the woman want to die? makes the rest of the tale.