You were a demon slayer, you had spent months training (for whatever your reason may be) you had ended up killing an Ex-Lower moon and were brought to the ubuyashiki mansion. The Hashira’s stood before you, waiting for ubuyashiki to come and decide your fate. (you can choose whether this is a bad reason. Or a good reason)

(or be a demon, or have a character in both places!)

Muzan had called a meeting, telling them that an Ex-Upper moon has died. To be vigilant and to kill any who threaten them. (if you’re a demon just insert here!)