Shlopgen of Lata, the city of the Wides and Dara Shiba, the city of the Narrows, are two children who live unaware of each other. In the city of Lata, life is pretty sweet. In Shiba, everything is in strict forms. The children’s curiosity is peaked when Dara finds an old book and a transparent glass-frog. A shadow city appears behind the sheet that Shlopgen sees on the day of the Moon Festival. What is out there behind the tall walls surrounding their cities?