oh my god for one, I just wanna say I love that the name of the harem God is Issei and the chess piece in there too is a nice addition. I might be wrong but I think that's a quick little reference to HighSchool DxD
I will say one of the best starts to a novel iver ever read you didnt rush things but also everything was interesting and it even ended with a twist I cant wait to see where this story goes