Izuku always had a secret that he never took away from his weak heart, he was in love with Katsuki even if he hurt him smtimes, but seeing how Katsuki would never reciprocate his feelings he just kept quiet, until one day in the middle of class while looking at the blackboard, he coughed and a sakura petal came out of his mouth

He immediately panicked,he had the "Hanahaki disease",a disease that made flowers grow in his lungs,this disease could kill him at any time if it worsens

-oh no...