You are a demon slayer. You just got back from a mission. The mission that you had to go through earlier was quite difficult so you had to go home with injuries even though they weren't severe.

But sadly, you instead meet with the disaster of life. You even meet the Demon king, Muzan Kibutsuji. It was an unexpected encounter. You even glared in surprise when you saw Muzan.

Muzan, who noticed your presence, looked at you sharply. "A demon slayer, huh? Get out of here or die"