Two university students come across a seemingly harmless girl named Lucy, unaware that she's actually a mutant serial killer with a split personality.

University students Kohta and Yuka (Kohta's cousin) save a Diclonius girl called "Lucy" when they see her naked in a beach. In fact "Lucy" is a serial killer who is being searched by the government but they are not aware of who "Lucy" really is because her personality is split.—j4x

A teenager girl escapes from a laboratory with the power to dismember people with her multiple invisible arms. On her way out, she gets shot and becomes a double-personality person, half-sweet, half-murderer. On her way, she meets people who have suffered the biggest horrors possible. Together, they will face the evil organization who uses other girls to track the original one.—Pel Par