I really hope you don’t intend to turn this into a poly relationship, or a harem. The dynamic between new-Momonga and the MC is fine. If this turns into a harem, I feel like it would be taking advantage of new-momonga’s more outwardly timid nature.
Love the description of the world item.. Also this one is deffently mega broken it was even gliched to where if it was used as a club and not activated it wouldn't be used up and would still do crazy damage at least this is what other overlord fanfics told me