Kazuyoshi, who won 4 billion yen in a lottery he bought on a whim, flees from the hyenas who smelled the scent of money to an old house passed down from his ancestors. While investigating the house, he discovers a room that can travel to another world. In a world with a considerably low cultural and technological level, the protagonist tries to find his worth in that world by bringing in goods and technology. Main story is complete. A sequel is being posted irregularly. *Published in Futabasha's new label, Monster Bunko. The book version is also complete. All 18 volumes of the paperback are currently on sale. A comic adaptation is currently being serialized on Comic Walker. A spin-off manga, "Marie's Isteria Commercial Development Chronicle," is available in 6 volumes from Gau Gau Monster.