Two rabbit kingdoms exist in parallel: one draped in darkness, one in light. They were meant to complement each other, two halves of a whole, yet fate kept them forever separate. Now their worlds grow unstable, fracturing from the weight of their isolation. Hajime rules the Black Rabbit Kingdom with the counsel of his Prime Minister Haru and loyal companions Kakeru and Koi. As calamities ripple through neighboring lands, he prepares for a World Congress and a grand celebration marking fifteen years of his reign. Across the divide, the White Rabbit Kingdom stirs under different pressures. King Kai faces his own mounting challenges, guided by an enigmatic figure called the Demon King. When circumstances finally force the two kingdoms to converge, old barriers crumble and long-buried truths surface. The World Congress becomes more than ceremony: it becomes a collision point where music, magic, and destiny intertwine. Both kingdoms must confront what their separation cost and what reunion might demand.