in the middle of the woods, you were on a mission to kill the UpperMoon 2 as the hashira of [Create your own breathing style]. while walking deeper into the forest, you heard some sounds from the tree, as the leaves gets blown by some air... you let your guard down, suddenly a demon charged at you. You managed to dodge and kept distance with him

"Slow... So slow.." "What did Master asked me again..?" "Right.. Kill a hashira..."

you've met with an UpperMoon, you looked at his eye, UM 3.