This story and most of its ideas are completely original. However there is some inspiration from those like Solo Leveling, Omniscient Reader, and others like that but no direct conections at all.
While this is going to be a very enjoyable story for everyone, there is twists of mythologies and religions that some might find difficult. This is just my own personal twists on this story and its over all in universe creation, not saying anything is true or I prefer one or the other or anything of the sort. If you are heavily religious then as much as I regret it I urge you to pass on this story.
I hope you enjoy