Yui conducts research activities in an unofficial unit. She follows a strange case of young women dying mysteriously one after another. Before long, he finds out the existence of the "pleasure drug" and the organization behind the incident. Yui tried to infiltrate alone, but fell into a trap and was confined. The boss, who is annoyed by Yui who refuses to talk about the unfolding Ryou, administers "pleasure drugs" one after another.