Antisocial, dorky boy seeks fun-loving, sexy vampire for blood-sucking and transforming into her minion.

Nanakusa is a vampire. That’s okay with human Ko, he wants to be one too but transformation doesn’t come that easily...

Our human friends are attacked by a mysterious male vampire. Luckily—or unluckily, depending on your point of view—Ko’s half-vampire mode is growing ever more powerful. Who turned the attacker, and what is he after? No sooner are these questions answered than new ones arise as a second attacker arrives on the scene—and she’s targeting both humans and vampires!