Kazura bought a lottery ticket on a whim but he was selected as the winner and received 4 billion yen (about 40 Million US$). To evade the hyena's that smell the scent of money, Kazura takes shelter in an old residence that was handed down from generation to generation. When Kazura is investigating the place that would become his shelter, he stumbled on a certain room where it is possible to go to another world. The culture and technology level of that world is relatively low. The protagonist sometimes brings back goods or sometimes technological knowledge. At that world, he will find his value as a person.