Kazura was selected as the winner on a lottery that he bought on a whim and received 4000000000 billion yen
To evade the hyenas that smelled the scent of his money Kazura took refuge at an old residence that had been handed down from generation to generation in his family
When Kazura was investigating the place that would become his shelter he stumbled on a certain room where it was possible to go into and back from another world
The culture and technology level of that world was relatively low The protagonist sometimes brought goods sometimes brought technological knowledge
At that world he would find his true value as a person