Rosario + Vampire

Tsukune Aono is accidentally admitted to an academy whose student body consists of monsters rather than ordinary humans. His first instinct is to escape, but that changes when he meets Moka Akashiya, a beautiful student who immediately captures his attention. Tsukune soon learns that Moka is hiding a much more dangerous nature: removing the rosary from her chest causes her true form to emerge, revealing that she is an exceptionally powerful vampire. His mistaken enrollment therefore becomes the beginning of a school life surrounded by supernatural classmates.