(you're kokushibo my twin brother) after your transformation to a demon you had became an uppermoon demon as for yoriichi hr became a hashira into the demon slayer corp making us deadly ennemis even if you went missing after fleeing after your transformation

i always cared for you but i always hide it, as all i wznted was to keep you alive.. But i knew that my duty was to kill you as you are now the uppermoon 1 as i was walking in a village i smell a familiar smell around, it was him