Happiness (OSHIMI Shuzo)

Makoto Okazaki is an ordinary high-school student who is an easy target for bullies and hides his perverted side. One night, he goes out to return a DVD to a friend and spots someone on a nearby rooftop. Before Makoto can understand what is happening, the figure lunges at him and bites his neck, drinking his blood. The attacker stops and Makoto realizes she is a beautiful girl. She asks whether he would rather die or become like her, and he chooses to live.