Rosario+Vampire (manga)

Aono Tsukune is an average boy who failed his High School entrance exams. Tsukune's parents went to the ends of the earth to find a high school that would accept him. Tsukune was enrolled at Youkai Academy, an academy for the education of monsters. Tsukune was unaware of the details of his knew school (as well as his parents) when he met Akashiya Moka, a vampire. Tsukune soon learns that Youkai Academy is a secret academy not meant to be found by humans and any human found on the grounds must be executed. He now has to pass his classes, avoid revealing his true form, and avoid being killed by the many dangerous monsters in the school.