The adaptation of the visual novel, created by Black Package Try Studio in 2005, takes hentai's action into the modern world. Three special agents, represented as girls, enter a closed laboratory in which, according to assumptions, a new, powerful drug is being developed.

At first glance, hentai's main character, Kaito, was captivated by his father's new wife, Sayoko. She seemed modest and decent, but passion and lust smoldered inside her.