Hazuki is a vampire, and sucks Kouhei’s blood intending to make him her servant. She wants him to help her escape the castle in which she has been imprisoned for years. But Kouhei is a blockhead who is totally insensitive to occult influences, and shocks her by not being affected by her vampire magic at all. He refuses to become her servant, and while they are arguing, Hazuki’s protector/jailer, the giant Viko appears. He would never harm Hazuki, but as for Kouhei….