@Davesgamecave Yeah. From some of the previous chapters, it's a massive training ground meant to teach warriors skills needed to fight the creatures now in the real world -or winnow them out if they can't/won't learn.
The Galactic Navy Officer Becomes an Adventurer
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM