Alien arc (12)
This arc is different from other arcs.
This arc begins in even further future. The time is set in year 12328. It basically skips about 5 generations from year 9599. This setting has huge inspects on a lot of things. United Sol is just a record in a history book for an example.
The story starts basically anew with new characters.
[Alien arc]  [The Saviors] 
[Alien arc]  [Perpetual] 
It’s really hard to find a good opportunity for either Cecil(ia) or Sae to have a casual conversation. It’s why this episode was born.
This specific story existed for over decades even before the concept of the alien arc was conceived. It remained as an independent piece until I decided to stick in here with some modifications.