Ok, so just to be clear, is this the project that was once referred to as Adastra II, or is another Amicus game in the works?
It the sequel to Adastra. Since most of the story is taking place on Khemia I guess they decided to call it that.
They might even do something like name each new sequel based on the world where they take place, and since the Parents want Amicus to join the Galaxias together we might see each new sequel name and taking place on a different Sibling home world as he goes about that task.
Actually this Khemia chapter is taking place 3 years after the Cato riots and the MC left 9 months after that so this story is taking place a little over 2 years after Adastra. So the MC still has 6 years to go.
I do hope the in the chapter after this one that the MC shows up again though. Even if it's only the MC and Amicus being able to send letter/email via their portals. There is bound to be some way considering that Amicus is getting updates about what is happening on Earth (however delayed they may be).