Elfen Lied

Lucy violently escapes from the facility where she has been contained, but a sniper-shot knocks her off a cliff into the water below. Kohta and Yuka find Lucy and try to help her, but she cannot remember anything, nor understand the language

Kohta finds Nyu at the beach where Bandoh, a member of the SAT and his partner are scouting. Nyu is discovered by the team and becomes Lucy. Meanwhile, Yuka finds Kohta and takes him to the hospital. When he gets home, Nyu is waiting for him.

Nana, a Diclonius, has accepted the request to find Lucy.Nyu hits her head and becomes Lucy, but after having a flashback of Kohta, leaves.

Lucy and Nana fight. Lucy transforms back into Nyu and meets Yuka by accident. Yuka finds out that Mayu may be homeless. Meanwhile, Nana returns to the facility and Kurama's boss insists that Nana must die because she is now useless.

Mayu leaves because she doesn't want to be a burden. Kohta and Nyu show up just in time to tell the police that Mayu is a family member. Kohta and Yuka take Nyu to their school and Professor Kakuzawa, who is a Diclonius, notices it is Lucy.

Kohta returns to school and tries to talk to the professor, but only finds the assistant in his office. She takes him to find the professor dead in the basement lab. Bandoh escapes from the facility and goes on a hunt for Lucy.

Nana suggests to Bandoh that they work together since their goal is the same—to find Lucy. He rejects her offer, but tells her to make contact with him once she finds her.

Lucy surfaces but comes down with a fever. While she is sleeping, she has a dream about her childhood, how she came to use her vectors, and how she came to mistrust humans.

Lucy dreams about her childhood. She killed many people at the children's home because some boys killed her dog friend.

When Nana and Lucy meet, Nana tries to fight again. Elsewhere, Director Kakuzawa gives and order to use #35, whom is said to be a worse monster than Lucy...

#35 has been released. Kurama leaves the facility to talk to Bandoh; they make a deal that involves the destruction of Mariko. At the Kaede House, Nana hopes that Nyu doesn't transform to Lucy so they don't have to fight.

When the order is given to kill Nyu, she reverts back to Lucy and uses her vectors to repel bullets, thereby saving Kohta. This action unlocks the memory of Kohta's sister and father and how they were murdered.

Since Nana damaged Mariko's vectors, she is unable to use them and is taken to a place to be watched over. Kurama tells Nana that he must kill Mariko. Lucy goes to see Kohta and apologizes for making him feel sad so many times.

Nana is still settling in at Kohta's home. After nearly killing Mayu when her arm flies off while trying to chop lettuce, Nana is given the task of helping Nyū clean the house. However, Nana treats it as a competition between her and Nyū, and repeatedly hurts herself and damages the building as a result.