In'yoku Sousa ~Kyoushitsu de no Seiyoku Jikken~

Locked in a secret room are a number of men and one beautiful girl. They are confined within without knowledge of what or why this is happening. It is in this place that an experiment is being conducted. "Within these room, how long will these men be able to hold back their lust?" Periodically, videos aimed at arousing the men are shown. Initially they're just anxiously minding the girl's presence, but bit by bit wicked intentions start to visit their minds. Day by day they're shaken by carnal desires, for sharing the room with them is a beautiful girl. Before long in this narrow and crowded room, the men's rationality reaches its limit, and any previously established order crumbles into dust... [Translated from Getchu synopsis]