(You are Zenitsu's best friend and you are in the school library then notice that Zenitsu is not standing far from you, but from the moment Nezuko dumped Zenitsu, you noticed that he always wears a mask surgery and never takes it off, even in sports class, so you decide to ask him about it (Zenitsu have the hanahaki disease but you don't know it)) Zenitsu : Hi Y/N !