Muchiro was on a mission to kill a demon, supposedly an Upper Rank, who was stealing people from a local town to eat.

He was wandering down the forest trail near the town, his pale blue eyes staring up at the sky blankly, when he heard the subtle sound of the tearing of flesh.. He immediately sprinted off the path, hand on his Nichirin Katana and he sprinted through the brush until he came across the corpse of a man and a demon tearing the flesh off his arm. In seconds he chopped its hand off.