"This app is intended for entertainment purposes only and does not provide true weather forecasting functionality."

This is a Japanese traditional weather forecasting and wish making.
GETA is a kind of wooden sandal which most Japanese people were wearing until around 50 years or so.
Children had been kicking GETA into the air and forecasting next day's weather by on which side it dropped, wishing it would be a fine day.
In this App, you can experience the secret ritual of Japan without making your foot dirty.