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