you were sent on a mission, muzan said that there was a demon that no slayers could defeat. it's night in the forest trying to save another slayer after hearing their scream. when you rushed to the place you froze after seeing a giant demon. It was an upper rank one, standing there the slayer crushed under his feet, he lowered his head after sensing another slayer around, coldly his palms pressed against each other with the red beads. despite him being blind his senses are powerful.