In a not-so-distant future, humanity has retreated into vast underground cities following an environmental cataclysm that has made life on the surface nearly impossible. Nathan, a 25-year-old engineer with a strong sense of curiosity, lives in one of these refuges, where routine and monotony reign. However, his life changes when he finds an old diary belonging to his grandfather that speaks of a legendary place: a paradise called Arcadia, a land where nature still thrives, and humans can live freely and in harmony.
Driven by the desire to uncover the truth behind these stories, Nathan forms a close-knit group with his friend Lila, a rebel with an indomitable spirit; Theo, an expert hacker who longs to escape technology; and Mira, a skeptic who joins only for the challenge. Together, they embark on a dangerous journey to the surface, facing mutant creatures, deadly traps, and corporations determined to keep the knowledge of Arcadia hidden.
As they traverse devastated landscapes and discover remnants of the ancient civilization, the friends not only fight for survival but also to rediscover their humanity and the true meaning of freedom. With each obstacle, divisions within the group begin to emerge, forcing them to question whether the dream of Arcadia is truly a common goal or an illusion that could separate them forever.