The first twenty minutes exist to shatter you. Riku meets Schwi in the wreckage of everything, and the show commits completely to making you feel the weight of that moment, of two people finding each other when the world is ending. The animation doesn't just support this, it becomes the story, every frame burned with a precision that makes their romance feel like the only thing that matters in a dying world. Most prequels explain what came before. This one breaks you with it.

Six thousand years before Sora and Shiro, Disboard is consumed by war. The heavens are torn apart, stars are destroyed, and humanity, weak and without magic, stands on the brink of extinction. Amid the chaos, a young man named Riku leads his people toward the future he believes in. In the ruins of an Elf city, he finds Schwi, an Ex-Machina android exiled from her Cluster for studying human emotions. Convinced that feelings are why humanity has survived, she asks Riku to teach her what a human heart means. Together the unlikely pair fight against overwhelming odds to save the human race and bring peace to Disboard, in a fantasy film blending action, drama and romance.