The gang come across a boy named Takeshi who enters himself and Galina into a sumo tournament. After some intense training, the two inevitably face off against each other in the semi-finals, with Takeshi winning easily. However, Takeshi’s final opponent turns out to be a giant Yatter Mech who, despite some tough resistance from Takeshi, overpowers him. Realising the entire tournament was rigged in the Yattermen’s favor, the Doronbow Gang bring out their own Genghiskhan mech to fight against the Yatter Mechs. Defeating all of the mechs and becoming the champions of all the fighting tournaments, Leopard gives their winnings to Takeshi so he can help his mother.