Realm of shadows: the enchanted dungeon

Sebastian, a simple botanist, awakens with amnesia in a bizarre dungeon, and soon finds himself, much to his dismay, encountering a  girl who claims to be a Demon Queen—also suffering from amnesia. In a world where universes collide in a struggle for supremacy, the dungeon in which they find themselves becomes the playground of a capricious girl slowly regaining her powers, while she drags Sebastian along on a journey where he'll be forced out of his comfort zone. Surrounded by powerful women, and with a Demon Queen infatuated with him, Sebastian must adapt, or die trying. Join a different kind of harem, where NTR has no place.

This is anerotic novel, sorry if I've disappointed you 😅. It won't be a huge harem, but I like romance. There will be action, however, romance will be the most predominant. I apologize😪.