The opening scene doesn't warn you, doesn't ease you in. It shows you what Lucy is and what she'll do, then the show spends twelve episodes making you understand why she had to. The gore isn't decoration. Every act of violence carries the weight of a mind broken by captivity, and by the end you're not rooting for her survival so much as grieving what she could have been. This show costs something to watch, and it knows exactly what it's asking of you.

Lucy washes up on a beach with no memory of who she is. Kouta and his cousin Yuka find her and take her in, naming her Nyuu after the only sound she can make. They have no idea that she is a Diclonius, a horned mutant with invisible telekinetic arms, one of a kind that the government keeps confined in secret laboratories for experiments. Lucy has just broken out of such a facility, killing many guards before a head wound left her with a childlike second personality. Her murderous side may not be gone, and by giving her shelter, Kouta and Yuka are pulled into a world of government secrets and conspiracy. The story is a violent psychological horror drama with supernatural, romantic and ecchi elements.