Euphoria OVA Manaka Nemu Jigoku Shidō Hen Episode 1

6 students find themselves trapped in a strange ultramodern complex.
The hero Takato Keisuke, His childhood friend Hokari Kanae, classmate Ando Miyako, under classmate Mikaba Rika, English teacher Aoi Natsuki, same year Byakuya Rinne, and classmate Manaka Nemu.
While they are still confused about their odd circumstances, an "unknown voice" suddenly speaks to them:
"A game has now started”
They are put on to dance to the tune of a cruel computer game in these hidden white rooms, where failure to follow the game rules results in death.
After hearing the perverse and depraved requirements to win, Miyako gets pissed and snaps on the "mystery voice".
Suddenly the lights go out. While the girls scream the lights come back on revealing the white room again and they see Miyako bound to an ugly torture device.
"Anyone who quits the game will die"
Her screaming begins in cycle with electrical current.
With eyes wide open in horror, she pisses and shits herself.
Everyone else starts freaking out.
However, Keisuke seemed to be getting aroused by Miyako’s outward show.
That was his secret, his urge to assault and humiliate girls.
However, Nemu see right through him and knew.
Nemu takes advantage, forcing the character to surrender to him.
Keisuke was surprised by Nemu’s actions but he wants to defend Kanae and decides for the sake of escaping, he will defy others.
Can Keisuke break out from the white rooms and return to his usual life? Or can he hold back his own dark urges?