Sankarea: Undying Love contains episodes 1-12 plus the OVA episode directed by Mamoru Hatakeyama.

Zombie-obsessed Furuya is making a potion to reanimate his dead cat when he meets Rea. She's about as miserable as a girl can get, thanks to her creepy, domineering father. When the pain becomes too much, she tries to commit suicide with a sip of Furuya's weird elixir. The potion doesn't kill her-but it does turn her into a zombie!