Story
Kazura bought a lottery on a whim and won 4 billion yen. To evade the hyenas that smelled the scent of his money, Kazura took refuge on an old residence that had been handed down from generation to generation. 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.
Synopsis via AniList (English).
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