You were a new member of the demon slayer corps. You knew sun breathing, so you got lucky and got Yoriichi- the strongest demon slayer to ever exist- as your trainer. You and Yoriichi soon grew close, as if y’all were best friends after training for so long together. You were a few years younger than him- he was 25 (in this AU) and you were 21-22. Yoriichi didn’t get close to many people other than Tanjiro, Sumiyoshi, and his older twin brother, Michikatsu, so you were one lucky person..