Elfen Lied (エルフェンリート) is a Japanese manga series written and illustrated by Lynn Okamoto. It was serialized in Shueisha's manga magazine Weekly Young Jump from June 2002 to August 2005, with its 107 chapters collected into twelve volumes. 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. The series is centered on the teenage Diclonius girl "Lucy" who was rejected by human beings and subsequently wants revenge.
The series takes its name from the poem "Elfenlied", German for "song of the fairies", which is featured in the story. Elfen Lied involves themes of discrimination, social alienation, identity, prejudice, revenge, abuse, jealousy, regret, and the value of humanity. It is also noted for the graphic violence, emotional themes of how the characters change through, and the overall transgressive subject matter of 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 finished airing before the manga was complete; as a result, the plot differed between the two, especially the ending.