Daigo is a man working as a private detective. Looking for a better life, he moves to a new city. Shortly after arriving, he receives a call from a mysterious woman who hires him for a rather unusual case: every night, several men disappear without a trace.
His investigation leads him to a group of vampiresses who devour men’s souls when they are left unsatisfied after sex. After reporting back to the woman who hired him, Daigo is forced to interact with each of these women and find out more about who they really are. This leads to sexual encounters where he tests both the women and himself.
If he manages to defeat this sinful group of women, a greater and far more dangerous reward awaits him: confronting the woman who initially hired him.
But nothing is what it seems in this strange place, and once he completes his mission, he must face the most powerful and sexually insatiable vampiress in the city. Can Daigo survive this erotic frenzy? Will his life change once he discovers his true talent for satisfying women?