Kin Fuyuki is a red fox which had a human body in the past until an artificial organism tech came out, with him being one of the testers of it. After some years people left the world by going to other planets or living on virtual realities, but the last few people on Earth that had normal bodies died of old age. Kin was one of the few artificial organisms that decided to stay on Earth and explore its abandoned and empty cities, taking pictures and recording videos with two old cameras. After almost a year alone, he met Sudosu, a protogen that survived to all the events and they begun to explore this world together.