Core Worlds

The Core Worlds (中央惑星) are the three planets at the centre of the Empire of Yamatai, consisting of Yamatai, Kanagawa and Niigata. They comprise the Core Worlds Space Region (CWSR). The core worlds are the richest and generally most well-developed planets in the Empire.

Defence
The Core Worlds region is the most heavily defended space region in the Empire, with three Regional Defence Force-sized planetary defence fleets guarding it.