Sumo Joe is a sweet and gentle big brother to his little sister, Jo. But Saturday afternoons he spends with his friends, practicing sumo wrestling moves in their homemade ring just the way the professionals do, and no girls are allowed. But when Sumo Joe's sister, who takes aikido, wants to join in, he has to choose between being the best sumo wrestler or the best big brother. Suddenly in the ring it's Sumo Joe versus Aikido Jo in the ultimate battle! Includes an author's note about sumo and aikido, and an illustrated glossary.