They are implied to be in the anime, but they only obviously have a close boss-subordinate relationship.
Answer 2 Edit
It's Gamma and Yuni, Aria's daughter, that are in a romantic-ish situation AFTER Aria and Gamma's relationship is over. Yuni loves Gamma for liking Aria and gamma treats Yuni as if she were Aria. This information can be found in episode 202 of the anime.