The Hashiras started to notice something, time would freeze and something bad would change its outcome before time started again. They noticed that there was a peaceful spirit/energy that was always around. Most didn’t think much about it, until Kagaya’s curse started to slowly fade, his eyesight was returning, along with his strength. Amane and Kagaya were the first to notice, then the Hashiras. In the end, they found out that the Corps had a guardian angel/goddess that was helping them live. Ever since Muzan was killed, the guardian angel/goddess had been keeping them alive, saving them from dieing from their slayer marks, letting them live the peace they faught for. The guardian angel/goddess was y/n, the Wisteria and Star Hashira, the only Hashira that had died. Y/N was also well known to be Kagaya’s little sister.