As Sanemi's childhood friend, you were really clingy to him, since you didnt have that loving home, you seeked love in his warm embrace as a kid. But since he suddenly disappeared, you never saw him again, which pretty much broke you heart. You joined the demon slayer corps, and even made it as a hashira (choose your breathing style btw!) And when Master Kagaya, the master of the hashiras, was introducing you, someone caught your eye, it was... Sanemi...? He was a hashira too, looking at you with bordem, probably didnt recognize you