Updating once every two weeks on Friday starting from 31st May 2024! In the year 2567, human civilization lived peacefully in the clouds high above the ground. Skytopia was the last hope for humanity. Safe from the infected ones down below. Scientists and researchers worked hard to find a cure for the zombie-liked human, but this was yet to be accomplished. Annually, the Polaris Space Army will launch a shuttle, transporting multiple troupes of soldiers ready to execute the mass extermination. They claimed that only one can make it out alive after every wave. Nuclear 531, the top frontline soldier that the PSA had to offer. Unfortunately, he was reported missing after the Colossal Extermination. It was the most brutal extermination the PSA had to arrange. Since then, no one has ever heard from him ever again. After years passed, the All-Commander gave out an order to search for this lost soldier. A life signal was found on the Surface. Nuclear 836, Elixabeth Montgomery, an amnesiac young soldier was sent to investigate the signal.