Elfen Lied: Return of the King is a Fanfiction made by Doomevil. Taking place after the anime series, the ending of Elfen Lied that we saw was just a dream. Lucy is instead re-captured by Chief Kakuzawa.
The story follows a different protagonist named Leon, trying to find out what happened during the bridge incident in the final episode. He will be faced against many odds, and things will start to get worse, while unexplained things behind the Diclonius will be uncovered.