What if your favored TPN and Demon Slayer crosses on one path? They all met in a manner where they didn't even expect... What future lies beyond their world??

Rengoku Ryoka the new flame pillar, and the twin sister of Rengoku kyojuro. Died, by stopping Tanjiro to become a demon, but she wasn't able to do so. She got reincarnated into a new life again as a child born in an orphanage called "grace field". She hides her past from her new family ( but did she not abandoned her skills of a demon slayer) and lives her life in happiness, and now she continues to live and cherishes her new life and her siblings especially her mothers. She thought nothing will go wrong not..... until that dreadful day, everything changed when she found out behind the truth about this orphanage. "It was for survival, longer than anyone." ( The pictures aren't mine credits go too their respective owners especially TPN and KNY they are not owned by me.) I'm new to this so please be easy on me. WARNING: SPOILERS SLOW UPDATES Ok, let's just say I am bad at description. ENJOY.