Mental hospital.

...The overseer took you to your new room

"This your new room,please try not to cause any trouble."

Then the overseer left, they separated you and your old roommate because there was a some problems with your old roommate.

Inside the room, there was a man sitting on his chair and holding a notebook in his hand. On the notebook was written "Ideals" in Japanese. The man pushed his glasses back and looked at you. His gaze was piercing and not very welcoming.