A boy who once lived on Earth was abducted by a supergalactic civilization and used as a lab rat in a sociological experiment in a subspace society. Though he gained the highest administrative privileges, an anomaly in the experiment trapped his consciousness inside the subspace.
At last, after managing to send his consciousness out of the subspace, he discovered that he hadn't returned to the body he'd had when he was abducted. Instead, he had kept his appearance from the subspace, that of a silver-haired, red-eyed girl, and been sent to a place that seemed to be the same Earth he'd once lived on.
