Everyone's become an adventurer, so who's going to put in the effort themselves?

Adventurers, guilds, dragons, churches, and fallen gods. In this new era, humanity explores a future devoid of its gods, relying on the sacred marks and bloodlines they left behind.
After being transported alone to this world named after the dungeon 'Fafner' and becoming an alien, Lynn knew that he had become a 'quasi-homelander' of this world.
What? I have to work hard to become a citizen of the motherland? Well, Miss Advisor, Lady City Lord, Madam Chief, I understand everything now!
(This story is a harem story; it does not accept single women, does not accept female humans, and has a serious fetish for interracial races. Readers are advised to take note.)