Elfen Lied

Lucy, who is said to be the first Diclonius, manages to break free of her confines and brutally murders most of the guards in the laboratory where she was being held. She eventually gets shot in the head and drops into the ocean. She survives and manages to drift along to a beach, where two teenage cousins named Kouta and Yuka discover her. Having lost her memory, she was named after the only thing that she can now say, "Nyuu”. The two cousins allow her to stay at Kouta's home. However, it appears that Lucy is not dead just yet, and the government is not going to sit back and let her run free…!