SumoKitty is about a stray kitty that is looking for food and warm home. He follows Sumo wrestles home. When he proves his worth by catching a mouse, he earns his place. Over time he gets fat and the mice come back but he is out of shape. The sumo wrestlers teach SumoKitty patience and moves to catch the mice.

In this book, the author included the Japanese words for the wrestling moves.