Tonight, he is also summoning the Outga Wolf Armor to kill the man-eating monster Hora. At this time, the Ring Master "Koyori" appears. She tells Ryuga about an emergency that threatens the world and wants to get the help of the Golden Knight. "The Gate of Destruction is about to open" The Gate of Destruction is believed to be the gate through which Hora first appeared in the human world. For some reason, it is said that it is about to open again. Under the leadership of Koyori, Ryuga came to the city of Clea, where the gate is located. In this city, the dark aura leaked from the "Gate of Destruction" spreads. Ryuga senses the evil aura and immediately fights Hora. In the fierce battle, a mysterious Ring Knight suddenly appears. He is "Shiraha Souma" wearing "steel" armor. As the nameless knight "steel" hunting Hora, what is his fate! ? Can Ryuga prevent the opening of the "Gate of Destruction"! ? Now, a magnificent story that approaches the origin of the Guardian begins.