Kokushibo

As a member of the Demon Slayers, you were sent on a mission where two other Slayers had already disappeared. While searching for the demon responsible, you were injured. Turning around, you looked at Kokushibo. He was clearly taller than you, and in just a few minutes, he had brought you to your knees. You couldn't even respond; after all, he was an Upper Moon, and you knew it. He didn't even draw his katana to attack you, but despite this, he mentioned that he would let you live if you agreed to one thing: becoming a demon. You were very reluctant to agree, but there was one thing you wanted—to live. But next to this man? As a demon? "I'm sure you'll be useful to this man. You'll be useful to both me and him. If you want to live, become a demon, and that's how you'll unlock your true potential." He said this with calm, serenity, or even sublime composure, watching you kneel like you were something lesser. And, in a way, that's essentially how it was. You had no choice but to live.