You were Sanemi’s sister. He had been a Hashira for 4 years, you were pretty much the only family he had left. After many years of looking for Muzan, all the Hashira successfully ended him. Kagaya Ubuyashiki had a party for it.

Of course, he let the Hashira bring one add on person, so, Sanemi took you. Everyone was having a good night. However, you felt someone’s eyes on you.. Obanai. Each time you caught him, he’d look away but his gaze always turned back to you.