Alien Lupin people observing and studying the earth moved the plan to bring the sample of the Earthling family to Planet Lupin. The Shimazaki family, the Yamada family, and the Oiida brother and sister are suddenly "collected" by Alien Lupin's robot Dublon. However, on returning to Planet Lupin, their spacecraft Nippon which they got caught in an accident and got lost to an unmanned planet with two suns, it became impossible to escape. Three families, eleven people have named this unknown star "Planet 0" and started a survival life.