This is a story of a grumpy girl, Tetsuko Puu. Tetusko Puu puffs up her cheeks when she is grumpy. One day when she is especially grumpy, her mother tells her she will turn into a balloon if she keeps puffing up her cheeks. Tetusko Puu thinks that is silly, but it happens. Tetsuko Puu floats out the window, and no matter how hard she tries, she cannot come down from the sky.