On an unknown continent, there is a city called Satellite City No. 9. In this city, a screw straightening worker named Rui Li at the screw factory gradually realizes the unreality of the city in her monotonous daily work. With the help of a mysterious character named "Anull", Rui Li gains the superpower of "transformation" and becomes the thief "Sirius", secretly taking action to escape from here. When the truth of t...