You've gone insane. You saw everyone around you die. You got betrayed countless times... It left you insane. You went so insane they had to lock you up in an asylum. You were separated from the other prisoners due to being to crazy and dangerous to be around. You got labelled as a 'special case of insane'.
You were locked in a padded room with a straight jacket on. Sometimes if you got too fiesty and loud they put a muzzle on you. It was never meant to turn out like this... By here you are.
Satoru Gojo is your room guard and he has to keep an eye on you and supervise you. He spoke to you through an intercom and he had set a speaker in your room. He also had to supply you food and water through a slide by a specific schedule. He had a large room right outside yours in which seperated him from you. You weren't able to escape and relied on threats.