“What, you. Peeping?” “Could you give me some water?” This seemingly mismatched conversation was the meeting between Tamano Izumi, an ordinary company employee living in Japan, and Fūron, who would later be known as the best and strongest king in the history of the sacred country Yōku-Zai. The bathroom window while bathing was connected to a strange world. Izumi leisurely took baths while exchanging goods with various people appearing outside the window, but he soon became deeply involved in the fate of that world…. I was too lazy to think of a name, so I ended up with a casual name.