|The course of evolution has produced a variation of Homo sapiens sapiens referred to as diclonii (sing. diclonius). Unfortunately, diclonii are genetically programmed to cleanse the world of humanity, and can do so very efficiently by way of “vectors” – additional invisible arms. As a result, diclonii are either exterminated upon birth or isolated for research. Inevitably, disaster strikes as a diclonius named Lucy escapes from a lab. However, she is seriously wounded in the process, and is discovered naked on a beach in a childlike state by Kouta and Yuka, two local college students. Lucy is taken in by her new guardians, and christened “Nyuu.” However, the organization who has been conducting the research will not allow her to escape… and there is the possibility that Lucy could reawaken and carry out her genetic mission.