The Smart Brain Corporation, the world's most powerful corporation, is trying to take over the world using Orphnoch, the next stage in humanity's evolution, to covertly kill off the human population. In pursuit of this, they develop suits of powerful armor, called Rider Gear (Faiz, Kaixa, and Delta), to find and protect the Orphnoch King, who can fix a defect with Orphnoch DNAwhich causes their genetic structure to break down, leading to death. The Rider Gears are stolen by Hanagata, the Goat Orphnoch and former cheif of Smart Brain. He sends them to his foster children (dubbed by the Ryuseiji), so they can stop the Orphnoch from achieving their goal.
