Reborn as the Shadow Prince: My Brother is the Hero

My new life began inside the legendary Shadow Moon, resurrected by the monstrous Chrysis Empire. Their command? Destroy Kamen Rider RX, Earth's Solar Knight and my fated rival. I am the villain they expect, bound to an impossible task. But I am no puppet. A reincarnated soul, driven by a strange \"instinct,\" I see the flaws in their grand invasion. My first move: a secret pact with RX. Our 'fated' battle? A meticulously crafted deception. We'll play the part of mortal enemies, training and gathering intelligence, all while plotting to dismantle the Empire from within. Our coordinated strike just decimated their jealous captains, but the galactic Emperor looms. How long can two \"arch-rivals\" deceive an entire empire while preparing for a war that will decide Earth's fate, and their own precarious lives?