Whole Elfen Leid by anime-fin torrent

Imprisoned under tight military security, Lucy, a genetically-altered human known as a Diclonius, escapes her confines in a wave of bloody violence and brutality. Now lost, alone, and stricken with amnesia, she wanders into a kindly family that takes her under their care, oblivious to the latent destructive power that this innocent-looking girl harbors!