The year was 2041 when the Freeport Space Station plummeted onto Earth, causing the catastrophic "Great Cataclysm" that resulted in the destruction and pollution of the planet's ecosystem. As resources became scarce, surviving groups clashed, ultimately leading to the downfall of humanity. However, life blossomed within a moon base that was originally intended for Mars exploration, and "The City of Eden" emerged as a thriving metropolis in 2267. Takeru, an avid participant in Tube Races, made a costly mistake that resulted in his punishment: to work voluntarily outside the city. As he toiled on the ruins outside the city limits, Takeru's search for the truth behind Eden's origins and the Earth's downfall may lead him to uncover a stunning revelation.