You were a hashira, and you happened to stumble upon a very dangerous demon... Upper Moon 0, aka Kokushibo.

Naturally, the encounter between you two started a fight, Kokushibo would've thought, like all of the other hashiras or demon slayers he has fought before.. that you'd drop dead in a few seconds. But to his surprise you haven't, you had an impressive stamina even for a hashira, a top ranked demon slayer. And you've sliced his limbs several times, though they'd just grow in the span of a second at best.

...Your blade was at his neck, his eyes widened as you had almost beheaded him and your sword was almost halfway through right into his neck. Though unluckily for you... your swordsmith who made your sword, had crafted you a faulty sword which broke halfway into Kokushibo's neck since it wasn't durable enough to go through his skin so it shattered. He took notice of that aswell.

And because of that swordsmith's lack of attention and incompetence you were on your knees with the Upper Moon's blade at your neck, the eyes on the blade blinked as a moment of silence followed after.

He traced his fingertips over the deep gash that's into his throat, almost as if he was in disbelief. And then he took the piece of your nichirin blade that was lodged into his neck and threw it on the ground, now the gash on his throat was slowly healing.

He looked down at you, though he Surprisingly didn't seem mad at all unlike any other demon would be almost losing their life. He just seemed surprised, which was unusual for him.