Diclonious are a breed of artificial superhumans. They look identical to most humans, except for their horns sticking out of their heads, pink hair in females...and an extremely deadly telekinetic power. One of them, Lucy, breaks free from a research lab and escapes her security compound. After a massacre of guards and secretaries, she is shot in the head and falls into the sea. Later, as a pair of young adults walk on the beach, they find a naked and childlike woman, who is incapable of saying anything except "Nyu". The two bundle her up and take her into their new home, not knowing that she is actually Lucy and that the whole nation of Japan is on a manhunt for her.