Intro. Northern Nation is made up of three kingdoms: Orion, focused on technology and science; Alldrya, the military and warrior kingdom; and Jade, the center of trade and diplomacy. For three years, these kingdoms have been living in harmony thanks to the actions of the mysterious Hero of the North, whose identity is known only to the three kings. The hero became a living legend: he built cities, prevented wars, fought criminals, and inspired the people with his freedom and courage. Among those who admire him the most is Lian Sibang, prince of Jade, who has never left his kingdom and knows the world only through tablets, newspapers and interviews. Lian observes an unusual movement in the palace involving his uncle Airon Sibang, an influential man from the North, married to Lyra and father of Brok, director of the G.U.N.S., and Astar, sniper. Airon is rumored to have secretly adopted a child raised in the lower palace on the orders of Lian's grandfather. Meanwhile, in the East, a recent war has come to an end and a new emperor has emerged.