Desolate Domain Across Endless Worlds - Anime & Comics

Waking up Axel found himself in the void of nothingness where countless worlds exist, And so Axel started his journey traveling world by world strengthening and improving himself as he started building an empire stretching across countless worlds...

(I Know the name is a bit long but every time i try something its already used --*)
(The worlds he will go to are still not chosen, but i do have some in mind, you can still recommend some to me and i will choose from them)
(Harem, No bullshit system/ROB)