World Battle Tournament named “Big Battle August” is held in U.S. once for several years. The invitation letter of this tournament came to Otokojuku. They were the champions of last tournament. Momotaro and other boys of Otokojuku went to US, and won the battles in Hawaii, Niagara Falls, Alaska and Manhattan. The final battle was held in Jail Island, and they fought with the strongest guy named B.J Blues and his followers named “Three S”.