tsukune aono is an average teenager who is unable to get into any local high schools due to his poor grades. as a last ditch effort to secure his education, his parents enroll him in a private school called yokai academy, which he discovers is a boarding school for monsters. the school teaches monsters how to coexist with humans, including disguising as them, but any real humans found on campus are to be killed. although he fears for his life, tsukune befriends a beautiful vampire girl named moka akashiya, who enjoys his company and especially the taste of his blood. during a fight with a school bully, tsukune accidentally removes the rosario around moka's neck, and discovers that she transforms into a powerful vampire with a completely different personality.