Yui conducts research activities in an unofficial unit. She follows a strange case of young women dying mysteriously one after another. She eventually finds out the existence of the "pleasure drug" and the organization behind the incident. She tried to infiltrate alone, but she was Yui, but she fell into a trap and was confined. The boss, who is annoyed at Yui who does not open her mouth to her unfolding humiliation, administers "pleasure drugs" one after another.
