Chapter 66.5
Kazura was selected as the winner on a lottery that he bought on a whim, and received 4,000,000,000 (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.Source: ComicWalker
Chapter 51
After winning a 4 Billion Yen lottery, I quit my company job. But I ended up in a different world doing some serious volunteering, saving a poor village with contemporary Japanese materials and technology from the home center. What would happen if I bring modern home electrical appliances over there from Japan? And it seems I would fall in love with a beautiful girl in the village.