[Rinvelt]

Anos never really struggles (some enemies are tough, though) as he's the strongest being in the multiverse.
There are two heroines, but the romance in the novel is low.
Also, the world building is great. Though it's developped little by little, so you won't see that in the anime.

EDIT: Ah, and when I say the romance is low, it's for Anos. Other characters have some nice romances.