In the colossal artificial celestial body of APOSIMZ, with a diameter spanning 200,000 kilometers, lies a core space enveloped by a massive shell. Following a defeat in a war against the core five millennia ago, a group was banished to the frigid surface, battling the pervasive Frame disease and hostile automatons amidst the ruins. Against all odds, these resilient individuals manage to eke out an existence in this harsh environment.