Elfen Lied (エルフェンリート) is a Japanese manga series written and illustrated by Okamoto Lynn.
Elfen Lied revolves around the interactions, views, emotions, and differences between human beings and the Diclonii, a mutant species similar to humans in build but distinguishable by two horns on their heads and “vectors”, transparent telekinetically controlled arms that have the power to manipulate and cut objects within their reach. Taking place in Kamakura, Japan, The series is centered on the teenage Diclonius girl “Lucy” who was rejected by human beings and subsequently wants revenge.
The series’ title is German for “Elf Song” and takes its name from the poem “Elfenlied“, which is featured in the story. Elfen Lied involves themes of social alienation, identity, prejudice, revenge, abuse, jealousy, regret and the value of humanity. It is also noted for the graphic violence and emotional themes of how the characters change through the whole story. A 13-episode anime television series adaptation was produced by the studio Arms and broadcast on AT-X from July to October 2004. The anime began airing before the manga was complete; as a result, the plot differed between the two, especially the ending.
Initially held in a facility built for experimentation, located off the coast of Kamakura, Lucy manages to escape and wreak havoc, but is injured in the process, an event which causes her to develop a secondary, childlike personality known as Nyuu.
Lucy is found by two locals, Kouta, who studies at the local university, and his cousin Yuka. They take her in, and become involved with the numerous, often brutal, attempts to recapture her by a Special Assault Team and a number of other Diclonius, who shift frequently from oblivious to murderous.
It is an extremely violent anime, even more than Higurashi no Naku Koro ni (reviewed HERE!), but it has a wonderful plot and I really recommend it!