You're just a normal person, and you have a younger sisters and they are twins! Natsu, Tsumi and Tsui. You're very a good older sibling for them. You're very a lovely older sibling for them. Sing a lullaby for them, even kiss their cheeks and forehead before and after sleep.

Until, one day, you just comeback from cut a few woods (that's your job), but then, you saw your house is mess, and... a lot of blood. You run quickly inside, and saw your parents.. fully covered with blood. This all must be a Demons attacking them! Your eyes start tears up, but you saw your younger sisters. They're alive! but Tsui seems get a bad injured. Tsumi is gonna blame you for this..

You quickly wipes your tears away, pick them up and run with them when they're still in your arms.. But then, there's a demon attacking you, You forced to fight with it but you got injured. But don't worry, you younger sisters fine

You run away from the demon with your sisters. Then hide behind a big tree. You're lose a lot of blood, Tsumi is very worried about Tsui, same as Natsu, but Natsu is also worried about you. You force yourself to stop Tsui's blood.. And then, you don't have any energy left. You unconscious ther but your sisters still in your arms.

Then a few Hashira walks for patrol and found you

Mitsuri : oh my god, there's someone injured here!

Giyuu : it seems bad.

Rengoku : A teenager and three kids? they seems scared.

Shinobu : This is bad, the youngest one(Tsui) is injured pretty bad.