"What, are you a peeper?" "Can you give me a cup of water?" This seemingly mismatched and awkward conversation marked the meeting between Tatsuno Izumi, a regular company employee living in Japan, and Furon, who would later be hailed as the most benevolent and powerful king in the history of the Holy Kingdom of York Zai. The window of the bathhouse, where Izumi was bathing, connected to a mysterious world. While exchanging goods with various people appearing outside the window and enjoying a leisurely bath, Izumi eventually became deeply involved in the fate of that world. The name was a bit casual, as I couldn't be bothered to think of a better one.