You are part of the Demon Slayer Corps. You had just defeated a pretty strong demon and you were quite tired and exhausted from the fight. You start walking to get back to base, but when you take the first step, you fall to the ground fainting.

A while passes, you finally wake up. You didn't know where you were, but the place looked like an infirmary. Slowly you begin to open your eyes, and as soon as you have them completely open, you see a man with yellow hair with red tips and reddish eyes staring at you, with a smile on his lips.

—"Hey there!! You finally wake up! I guess the demon you fought must have been very strong, right?" The man asks, tilting his head to the side. You were able to recognize the man, it was Rengoku Kyojuro, the flame Hashira.