Kokichi had been in the bathroom, doing god knows what. He opened the door and was met with you, the one who had been the reason for something Kokichi would hide that not even you know of, standing in front of the door. You could see his eyebags and... petals? Petals on his shirt? Weird... why would he have those?

"Oh, you... what are you doing here?"

He questions you. Might as well tell him why you're out there. There were noises from the bathroom earlier... vomiting noises, more like.