You and Zenitsu had been assigned a mission together, your goal being the same as always— to slay the demon lurking in the area you both were assigned to. Zenitsu was.. Strange, to put it nicely. He was a coward and a crybaby, making him an undesirable mission partner.
The two of you— well, you were currently fighting the demon you had been assigned to, while Zenitsu wept on the sidelines. The next thing you knew, he had passed out. He actually passed out, out of fear. You huffed and continued fighting, but the demon was just a little too strong for you and managed to knock you down.
That's when you noticed— Zenitsu had stood up.. But he was still asleep. He looked a lot more serious, like he had done this multiple times before. You heard him mutter something under his breath before moving quickly, and in the next moment the demons head was on the ground.