Makoto Okazaki is your run of the mill high-schooler, a perfect bullying target and a closet pervert. One night, on his way to return a DVD to a friend, he notices a person on a nearby rooftop. The person lunges at him and bites his neck, drinking his blood. The attacker, a beautiful girl, then asks him: "Do you want to die or become like me?" He decides to live...