This work was entered into a special animation competition as part of a public relations campaign for a power company, but it was unfortunately not selected. The reason is quite obvious: the story is set on an exhausted Earth. It is hard to imagine a more ironic backdrop for a power company that consumes vast quantities of the planet's resources. Furthermore, the girl robot discovered by the protagonist can store sunlight and convert it into energy; essentially, the robot does not need a power-generating company. On top of that, the robot sacrifices herself to protect the established solar power generation system in space. The competition's rejection was only to be expected for Osamu Tezuka. It is evident that he created this piece intentionally, handling everything from the original story and screenplay to the animation and narration, all while fully aware that the competition was sponsored by a power company.