In 2075, with the continuous development of space by humans, space debris has become a social problem. These abandoned satellites, rocket parts and other debris are orbiting, endangering the safety of surrounding space stations and spacecraft. The debris department where Hoshino Hachirota (voiced by Kazunari Tanaka) is located is a department dedicated to recycling or removing space debris. Tanabe Ai (voiced by Yukino May) is a newcomer who has just entered the space. She joined Technora's debris department with enthusiasm, but found that there was a huge gap between ideal and reality. She was deeply shocked by the fact that the members of the debris department were the last in line. This department is also called "half class". Because the garbage recycling efficiency is not high and is not valued by the company, the staff is only half of that of other classes. She was arranged to team up with Hoshino Hachirota. Facing this strange senior "Chantouba", she was also unwilling. However, in her repeated contacts with the universe, she began to gradually understand the debris recovery work. She also learned that her colleagues seemed to be careless but actually trustworthy. She began to slowly integrate into the "half class"...