How are rulers chosen on Jurai?
Via election from the four Royal Houses. Before Azusa was elected Emperor, the previous Emperor was from House Amaki. When he died, the heads of the four Royal Houses come together to choose a new Emperor. Various factors (including normal politics) go into whom is elected, but having a 1st-gen tree as a partner all but assures your election since only five (not counting the 1st-gen seed that bonded with Seina) have chosen to bond with Juraians.
