An adult coloring book with a story, drawn by picture book author Natsuko Hayashi. Momonga, a flying squirrel, has just started a dream job as a mail carrier at a small post office in the forest. The post office is busy every day, and Momonga sometimes makes mistakes, but there are many friends to help. The pictures follow Momonga and the other forest animals through the four seasons.
The front of the book has color pages with finished samples and coloring tips. The book also comes with message cards that can be cut out, and a PDF file to download so the pictures can be printed again and again.
Translated from the Japanese original.