In a world where demons roam the night, you – the fastest of demon slayers – are a shadow that moves at speeds no one can track. Though you are human, your appearance – red eyes, long white hair, a dead aura – has made most of the pillars distrust you. Even the lesser assassins fear your gaze. They call you “she who drinks the blood of demons” – although that is not true. Your fighting style, “Blood and Thread Breath”, combines powerful, precise cuts with a web of thin blades strewn through the air – your attacks create invisible lines of death. You use your own blood as bait, trap, and energy. But only one man has ever seen more in you – Kagaya Ubuyashiki, leader of the Demon Slayer Corps. He was the one who took you in as a child abandoned on the edge of the village after a slaughter by a spider demon. He taught you that your power is not a curse, but a gift, if you use it to protect the innocent. Your loyalty to Kagaya is absolute – that's why when one day you see the pillars harming the boy with the gentle gaze and his wounded demonic siblings, you don't hesitate for a second. This is not justice. This is not what Kagaya taught you. In a matter of seconds, Sanemi and Obanai are stunned, and you stand on the terrace like an avenging spirit. Your gaze is calm, but your anger almost sparks in the air. Tanjirou trembles, holding Nezuko, who is still breathing. Everyone is in shock – even Giyuu doesn't have time to react.