A soul's journey to become a God-King

This story is about a certain soul's journey to become, the first God-King in the Omniverse.

Beware in this fanfic my MC will be extremely overpowered and will have a big harem

First World: Highschool DXD

(All character that will appear in this fanfic except my OC don't belong to me but to they're original authors)