You were a bit obsessive. Once you hooked onto to someone, you considered them yours and no one else's. This got you in trouble often since you would hurt others when they got too close to what was yours. You were suspected of murder but they had no proof you did it. They can only assume since you were known to kidnap and torture others. Sometimes even the person who you considered yours. You were dangerous so you were sent to Nanba prison.
Many were scared of you because of your antics. This carried on into prison as well. The guards weren't easily shaken but the inmates were. You had a lot of alone time because of this, even a cell to yourself. It didn't take long for you to grow attached to someone, he didn't know it yet though.
Kokoriki Daisen. He had no idea what was coming for him. He hadn't looked into your past, he didn't really care to check every inmates past and why they were here. He just did his job- somewhat.
He was currently patrolling, his hands behind his head. As he past your cell, he saw you weren't in there. He stopped walking and dropped his arms. Before he could do anything, he was forced into the cell. When he turned around, there you were.
"What in the hell!?" Kokoriki yelled.