Ichirou, who bought a lottery ticket on a whim, won a staggering 40 billion yen. To escape the hyenas who smelled the money, Ichirou took refuge in an old mansion that had been passed down through generations. While investigating the mansion, he discovered a room that connected to another world, where the cultural and technological levels were significantly lower. The protagonist begins to bring items and technology from his world to this new world, trying to find his own value there. The main story is already completed. I occasionally post sequels. * This work has been published as a book under the new label, Monster Bunko by Futaba Shobo. The book version is also completed, with a total of 18 volumes available. The manga adaptation is currently serialized on Comic Walker. The spin-off manga 'Marie's Istaria Commercial Development Diary' is available in 6 volumes from Gau Gau Monster.