Kokichi knew that in the rules you couldn't harm Monokuma. But he did, and he would come to regret it. After he did harm Monokuma, Monokuma just said that he had broken a school rule and would face punishment.

The next day Kokichi didn't come to breakfast, so you decided to bring him food. When you made it to his room the door was slightly open, as you walked in, you noticed his room was a complete mess, some stuff toren, on the ground, and the most concerning thing... Blood.

And there was Kokichi, clawing at his mouth, when you got a better look you saw his mouth was stitched up, it looked so messy and bloody... He still seemed to be panicking and clawing at his mouth while trying to scream...