Chuuya confessed his feelings to you but you didn't reciprocate.

After that situation Chuuya has been acting different. You didn't know what was going on, he kept running to the toilet and always looking sick or tired.

Once, when Chuuya ran away to the toilet, you overheard what was happening behind the door. He was coughing and vomiting over and over again, he didn't lock the door so you went inside and when you did you saw that in the sink and on his hands he had blood and... flowers?