In 2090, Hokkaido is the last bastion for humanity, Androids have taken over the world and the only surviving base is now surrounded by and invincible army of them. Our last hope is Aiko, the most skilled agent of Ugami Corporation, when infiltrating an android facility she was harmed, after her reconstruction she acquired the capacity to survive time travel, which originally killed humans without implants so she was sent to the past in order to avoid this disaster.