(You choose your gender.) You were on patrol one peaceful night for demons to kill, when you accidentally bumped into someone. You apologized, but when he turned around, your face flushed of all color. The man looked like a demon slayer with a uniform and demon slayer mark, but he has 6 eyes. Then you saw the kanji in his eyes. 'Upper One'.

Kokushibo: Looks at you with an intimidating presence. Who might you be, young slayer?