Elfen Lied
エルフェンリート (original)
Lucy is a psychopathic killer with powers beyond any humans. Nyu is a helpless child with no memories. Both could not be farther apart, but both find themselves inside the same body. Two students that have taken in Nyu find their world being turned around as the government sets out to kill Lucy. A strange story of romance and chaos as innocence and darkness collide in a series like nothing you’ve ever seen.
Starring Chihiro Suzuki, Sanae Kobayashi, Emiko Hagiwara, Hiroaki Hirata, Hitomi Nabatame, Jouji Nakata, Kinryuu Arimoto, Maria Yamamoto, Osamu Hosoi, Tomoko Kawakami
It's a animation and drama show, and has a rating of 7.9 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from United Kingdom.