Founded by the Aizu samurai bloodline, the Red Domain is the undeniable military might of the Second World, home to the highest concentration of combative Powerhouses. This 1861 feudal Japanese territory is frozen in time, featuring hot springs, cherry blossom groves, and traditional wooden estates beneath a brilliant, eternal yellow-orange sun. The citizens glorify honorable death and intense martial arts training, with elite members manifesting their soul's red threads into deadly steel swords. It is a highly militarized society built on absolute loyalty, where traditional male-female pairings are strictly disdained as "Breeder" behavior in favor of pure warrior bonds.