In the "Nine Domains of China", an imaginary country that is prosperous on the surface but surging undercurrents, ancient heritage and modern technology are intertwined. The nine core cities are quietly infiltrated by the mysterious organization "Shadow Alliance" and its terrifying weirdo groups from the major Kamen Rider series (Gurangi, Ofei Enoch, Bengyuanti, etc.). Through reverse engineering, the local secret organization "Energy Research Institute" has given the knight system from aliens, the future or magic to local warriors - Kuuga, Faiz, Den-O, Build, Saber, Geats and other Heisei and Reiwa main knights all appeared on the stage, and launched a fierce duel with the Shadow League in their respective cities to protect their homeland.
Lin An, a young man from Liulijing, had no chance of transcendence, but because of a mysterious dark ring fragment, he accidentally awakened the dangerous power of the cosmic demon "Jagula" in Gurungi's death game! Holding the "Snake Heart Sword" condensed with dark purple energy, Lin An was forced to get involved in this unimaginable war vortex as he suffered the backlash of the unstable "demon transformation". He was alerted by Kuga, hunted by the Source Energy Research Institute, and locked under the lens of the mysterious traveler Decade.
Lin An, who refused to be swallowed up by power or become a research object, embarked on a thorny road with his keen mind and instinctive understanding of technology - to fully analyze Jakula's dark power, use technology as a bridge, and control the abyss! ** He came into contact with the remains of the knight, studied energy data, made his own guidance device, and struggled to survive on the edge of losing control of his power. When the Shadow Alliance's ultimate conspiracy threatened the entire Nine Realms and all the knights were forced to unite, Lin An finally completed his transformation - merging cutting-edge technology with the origin of Jakura
