So, does Holoearth have lore, or...?

If you chat with Anna Rocca and Cecile Gillet, they mention places like Yamato, Miyako, Cyber Akihabara, Underworld Academy, the walled city of Vesta... all of which are places from the Holonometria web mangas. Anna even mentions she's from 'harbor town Luna' iirc, which isn't mentioned in any of the mangas, and she also has a supervisor that doesn't want her to drive for some reason.

Is Cover trying their hand at worldbuilding, or am I just looking too much into easter eggs?