Redemption?

The shabana siblings... being born in a terrible place with a terrible mother and being around with terrible people... they thought the entire world was against them...
Things where better ever since they became demons... but since the exact moments of their death's...
They never thought for a moment if anyone besides them matter... they never thought they would trust anyone besides them...

Can their mindset change?

Hello there! This is NatsuDB the one who wrote Trains vs (PvZ) Zombies 1 and 0 and working on Raccoon City Incident and Trains vs Plants.
I present to you my first Isekaii and surpringly my first Demon Slayer / Kimetsu No Yaiba fanfic! based on a dream i had a couple of days ago.

The cover doesn't belong to me, nor Demons Slayer manga or anime nor its characters, nor the railroads that appear here.
I do own my Oc's and this fanfic.

(Btw if looking for the cover picture here's a link:
https://www.deviantart.com/santiagomaring/art/Gyutaro-and-Daki-6-Upper-Moon-KnY-893110734)

Arrived in #1 locomotives at some point.
Arrived in #1 reverseisekai at some Point.
(March 21, 2023) Arrived in #1 Ume