Elfen Lied FC!!!!

The Diclonius are a species of evolved humans with two cat-ear like horns and vectors, transparent telekinetically controlled arms that have the power to manipulate and cut objects within their reach. Diclonius are being held in a facility off the coast of Kamakura in Kanagawa, south of the city of Yokohama, by the scientist Kurama. The first of the Diclonius race, a teenage girl named by the staff as "Lucy," escapes using her vectors to deflect gunfire and effortlessly kill security guards. As she makes her way out of the facility, a sniper shoots her, breaking her metal helmet and causing her to fall into the sea. The next morning, Kohta is moving to Kamakura to study in a university where he is reunited with his cousin Yuka. He encounters Lucy on a beach in the area, naked with her head bleeding from the bullet wound and only capable of saying the word "Nyu." Kohta and Yuka decide to take her with them, naming her "Nyu" as a result.

A Diclonius named Nana and a Special Assault Team task force, led by the violent soldier Bando, are sent to hunt down Lucy. However, Lucy and her cold characteristics have not yet faded away; whenever she hits her head or is confronted with violence, she reverts to her sadistic side and makes transitions between her two personalities throughout the series. The first of which is seen against Bando, who has his eyes poked out, and Nana, who has all her limbs ripped off by Lucy's vectors. Eventually, Kurama decides to repair the bodies of Bando and Nana and send Nana back to Kamakura, contrary to his orders to put her down. Mayu and Nana both end up living in Kohta's household. Bando also returns to Kamakura, following his goal of revenge against Lucy. His injuries have been healed, but he has escaped the hospital before his forced sterilization, intended to "quarantine" the Diclonius virus given to him by Lucy.

Several developments in the story are made and explained in the latter end of the series regarding the pasts of the characters and the links between them. Mayu is revealed to have been molested by her stepfather, and Kurama is also revealed to be a carrier of Diclonius DNA. Professor Kakuzawa, Kurama's colleague and the son of his boss, is revealed to be a Diclonius just seconds before his head gets torn off by Lucy. Kurama's wife died as a result of complications after giving birth, and Kurama was almost forced to kill his newborn Diclonius daughter, however Kakuzawa's father, the head of the facility, agreed to let her live on the condition that explosives be planted inside her to be detonated if she escapes the facility and causes destruction in the human world. Lucy's past, why she turned sadistic, and her connections with Kohta are also revealed.

Toward the end of the series, Kurama is forced to unleash Mariko, his Diclonius daughter and disputedly the most powerful Diclonius, to kill Lucy and return the species into hiding forever. Mariko, Nana, Lucy and Kurama all cross paths near a bridge by the seaside, where Mariko and Nana discover that they both believe themselves to be Kurama's daughter, and Lucy is almost killed by Mariko. However, as Lucy kills the search team accompanying Mariko in retrieving her, including the majority of the remaining staff at the facility, Kurama is cornered with the last three diclonius left. He chooses instead to spend a final father-daughter moment and die with Mariko as the explosives in her detonate. Nana returns to the household with Kohta, Yuka and Mayu, and Lucy sees Kohta on the same set of steps as where they had their final conversation eight years earlier, telling him her true feelings, her remorse, and how she is in love with Kohta. Lucy leaves to face the remaining assault team deployed by the facility; her ultimate fate is uncertain, but the ending scene hints that she may be still alive.