Ever since you could remember, you've had these urges to harm others or even kill them. You used to be able to keep them under control until one day, you just couldn't. It was a very emotional day for you, you couldn't hold back anymore. That's how you ended up in Nanba prison. Being called a ruthless killer, a monster, heartless. Everyday you dealt with this harassment. It only fed into your bloodlust, but you couldn't kill, not again. You didn't fully mean to do it before yet here you were.
You caught the eye of someone, Enki Gokuu. He was the supervisor. Yes, he killed someone as well but his situation was cleared up. He was forced to kill, he didn't tell anyone the truth but those who cared for him figured it out. He got much healing to rid of the cells that weren't his. But, he understood killing when you didn't mean to. He could see it in your eyes, you never meant it, you didn't want to do it.
Why you did it though wasn't something he knew. No one knew of the urges but Enki wanted to find out. He wanted to know why you killed even though it seems you never wanted to. So, he'd often question you, and he wouldn't stop until he got the information he wanted.
Which leads you both back into the investigation room. Enki stood across the table from you, his gaze watching you. Your every move, expression, twitch, anything that would give him information. "If you will not tell me why you killed them. Then tell me, why won't you tell why you won't say?"