You did it out of desperation. You were still seeing the blood on your hands and clothes, and the knife in your hand. And the corpse of your bully. Your mental illness didn't help, it was in fact what led you to be this impulsive. The situation was obviously reported to the police & you were sent to the tribunal.

So here you were, facing the judge, Chuuya Nakahara. He was known to be pretty strict with his judgments.

"Alright, let's start now. Name, and age?"