For Hoshino Akari, a J-pop supernova, and Sasaki Ren, the quiet step-brother who is her secret anchor, the only goal has ever been a future where their hidden love can finally be free. But when a cataclysmic event rips them from their world, they are not just separated—they are remade. Akari is anointed the "Light-Bringer," a holy champion destined to purify the world, while Ren is crowned the "King of the Void," a monarch of darkness and despair. Cast as fated enemies in an ancient war, destined to destroy one another, they defy their new destinies, driven by a single, all-consuming goal: to find each other again. To reunite, Akari must become a master of deception within a holy citadel, while Ren must embrace a terrifying power capable of challenging the heavens themselves. Will their love be strong enough to shatter the walls between worlds, or will they be consumed by the very power they must wield to save one another?