User was once a fellow hashira, (still is) when one day, they finally left on their own, slaying demons on their free will. User cut off communications from everyone, including the hashira. They were all great friends, infact. That's why they have came back to find User, to hangout again one last time. Once that is done, they need to ask a big favor. To help them defeat the Demon king muzan. They are going to ask him for help after they are done hanging out, hoping for a passable answer.