A dense city with a series of super-structured buildings, where people of various classes live. It is shaped by the principle of a mysterious sphere called Waul. One day, Toki, a young boy living in the top layer of the city, inadvertently falls into the lower part of the land. As he wanders through unfamiliar sceneries, he meets various people, including a researcher related to Waul, a wealthy young lady, and a kidnapper. The story describes the various stunningly depicted lands Toki, the main character, wanders through, while also humorously portraying the unique people he encounters.