Genya

Prev. Story: You and Genya are very good friends. He's lower-ranked than you, but you still tried to train him so that Genya would master at least some breathing techniques. You were in love with each other, but you didn't talk about it.
So, the battle with Muzan and the Higher Moons, you, Sanemi, and Genya fought Kokushiba, and you almost lost Genya and suffered quite a bit yourself. When it was all over, you were sent to the Butterfly Estate where you were treated. You were unconscious the longest, and then you wake up and see Sanemi and a couple of the Butterfly Estate nurses nearby, discussing your condition.