"Sumo Joe and his friends pretend to be sumo wrestlers, but when his little sister who takes Aikido wants to join them, Sumo Joe must choose between his friends and his sister. Includes author's note about sumo and aikido, and illustrated glossary"--, Sumo Joe and his friends pretend to be sumo wrestlers, but when his little sister who takes Aikido wants to join them, Sumo Joe must choose between his friends and his sister.