Elfen Lied

After killing many facility employees, Lucy escapes from the facility where she has been contained. However, a sniper shoots her in the head as she is escaping and she falls into the water. When she reaches the shore, she doesn't remember her past and can't even speak except for saying "Nyu". At the shore, Kohta and Yuka find Lucy and try to help her. Since she doesn't seem to understand the language, Kohta and Yuka decide to bring her to Kohta's new residence and decide to call her "Nyu." When Kohta shows a seashell to Yuka saying that it is his little sister's memento, Nyu breaks it since she didn't understand what he was saying. Kohta gets very upset and Nyu runs out of the house.

Police are combing the city trying to find Lucy. Kohta finds Nyu at the beach where Bandoh, a member of SAT, and his partner are looking for Lucy. When they find Nyu, they beat Kohta up and take her. Bandoh tries to provoke her because he wants to fight one on one. Since she is Nyu right now, she gets very scared and does nothing. So Bandoh gives up and tells his partner to kill her. That is when Nyu becomes Lucy.

Kurama asks Nana to find Lucy using her ability as a Diclonius and Nana accepts the request. Kohta catches a cold and Yuka, who came to drop off her clothes for Nyu, realizes something is wrong. She sits by Kohta helping him get better. While she is there, she notices that Kohta thinks that his father died in a car accident and her sister died of a disease, although they both (probably) were killed by Lucy in a train.

Nana fights against Lucy and is wounded. Lucy then changes back to Nyu and meets Yuka by accident. Before meeting Nyu, Yuka finds out that Mayu may be homeless. Kohta gets a call from the hospital saying that someone was injured and goes there to finds Mayu and tells the hospital people that she is his relative and is in town for a visit. (She got injured when she tried to stop the fight between Nana and Lucy.) He takes her home where Yuka and Nyu are back and getting ready for dinner. Thinking Mayu probably hasn't eaten well, she suggests Mayu have dinner with them. She also suggests that Mayu should take a bath and stay the night with them.

Mayu stays over night with Kohta and Yukabut leaves them a note in the morning saying that she didn't want to be a burden to them. Kohta, Yuka and Nyu go looking for her. They tell the police officers that Mayu is their family. Kohta and Yuka decide to look after Mayu so they go see her mother to get permissiont. Kohta and Yuka take Nyu to their school and Professor Kakuzawa notices it is Lucy. He tells Kohta and Yuka that Lucy is his niece and he'll take her home.

Kohta goes back to school to talk to the professor and only finds his assistant. She takes Kohta down to the basement lab where they find Professor Kakuzawa's body. The following morning, Kohta and Yuka go out to look for Nyu. In a shrine, Lucy comes across Kohta and Yuka and she tries to get away from them. Recovering from his injuries, Bandoh escapes from the facility and tries to look for Lucy on his own. Mayu finds him at the beach, and talks to him. He first realizes that she saved him the night he was injured, and givers her is cell number saying he'll help her when she needs it. Then he asks her if she has seen a woman with horns, and gets mad when she seems to be hiding something. He threatens to hurt her unless she tells the truth.