In a post-apocalyptic world known as Enterra, humanity teeters on the brink of extinction due to a deadly virus. To safeguard life, a new race called the Enterrans emerges, but their once peaceful coexistence with humans ruptures into a full-fledged war. Emerging victorious, the Enterrans rename the planet and dominate the land. As hope wanes for humanity, a scientist entrusts his daughter, Yakumo Shindou, to a deep slumber with the dream of her rediscovering Shinzo, a legendary safe haven, and restoring harmony between the two races. Centuries later, Yakumo awakens to meet Mashura, an empathetic Enterran who joins her quest alongside Sago and Kutal. Together, they seek to unravel Yakumo's lost memories and locate Shinzo. Yet, amidst their journey, they face treachery from malevolent Enterrans intent on thwarting humanity's resurgence at any cost.