Lance, crown prince of the Galra Empire, is forced to flee his planet with his family and half of the population when Daibazaal faces an invasion from an alien species called the Revgeth. Keith, crown prince of Altea, on the other hand, is being forced into a marriage with princess Allura despite being gay. When the Galra turn to Altea for support against the Revgeth, Keith and Lance are thrown into each other's lives, facing a war they didn't ask for, and facing feelings they didn't know they had.