Cosmos

 (コソモス, Kosomosu) is a location in DARLING in the FRANXX.

It serves as APE's mobile aerial fortress and HQ. Cosmos is shown to be orbiting over Earth. It can be accessed from Earth by elevator, as shown in Episode 17 by the 9's. The Central HQ Council is also located here.

APE Central HQ Council
This is where the Lamarck Club meets.