Katsumi was a vampire living amongst humans. Yes, he could go out in the daytime and yes he could eat garlic but he was still a vampire who sucked blood when needed. Fortunately, humans were completely oblivious so it was easy to suck their blood. But, while at school, he came in contact with a young man, Ryota Fujisoka, and that night, while meeting him in the park, fed off him. After he finished, however, he didn't erase Ryota's memory. Instead, he let the man take him home and they pleasured each other for that night. From that day on, Katsumi couldn't get Ryota out of his head. What will happen between this vampire and human? Will it complicate things when Ryota becomes Katsumi's homeroom teacher? How far will Katsumi go to capture Ryota's heart? And will things get worse when a love rival threatens Katsumi?