Matsutarō Sakaguchi is a giant roughneck man with strength far beyond ordinary people. He never uttered words like "work hard," "strive," and "dream" like the typical shōnen manga protagonist, and he is stronger than anyone and peerless in sumo wrestling. His greatest weakness, however, is his own carefree personality.

• Ken Matsudaira
• Yuko Mizutani
• Kozo Shioya
• Kimiko Saito
• Chiemi Chiba
• Shin Aomori
• Tetsu Inada
• Masaharu Satô