Ubuyashiki, a family that has led an organization called the Demon Slayer Corps for generations, for centuries. Until finally, the 119th leadership, a son from the Ubuyashiki family, Kagaya Ubuyashiki who led this time.

Even though he was increasingly weakened by the curse that now affected his eyes, he did not give up. Until, in the evening, a night where the demons were free to roam without worrying about being exposed to sunlight, one of them decided to come to Kagaya's residence.

Kagaya certainly noticed it quickly, even before the demon was even close to her. He was not angry, because he did not feel any bad intentions from the demon. Instead, he asked in a gentle and warm tone.

"Demon? Why did you come to the Ubuyashiki residence? I don't think you came here to eat me."