No Game No Life: Zero

No Game No Life: Zero is a prequel film set 6,000 years before the events of the anime series, depicting the Great War that shaped the world of Disboard — the conflict that eventually led to Tet becoming the One True God and establishing the Ten Pledges. The story follows Riku, a human in a world where all races battle for supremacy in violent, devastating warfare. Humanity is nearly extinct, and Riku forms an alliance with Schwi, an Ex-Machina (machine) unit who was expelled from her network for attempting to understand the human heart. Together, they devise a plan to end the war and create a future worth living in, even knowing neither of them may survive to see it.

The film is simultaneously a standalone epic and a devastating piece of lore for fans of the series — because knowing how the main story ends allows viewers to understand the significance of what Riku and Schwi's sacrifice ultimately achieved. Zero is consistently ranked among the most emotionally powerful anime films of the 2010s, praised for its tragic romance, stunning visual design, and the way it recontextualizes the playful world of the main series as something built on immense sacrifice. It is technically a prequel, so it can be watched without seeing the series first, but the emotional payoff is dramatically enhanced for those who understand Disboard's current era as the world that Riku and Schwi died to create.