Grand Champion Futabayama, the biggest drawing card in Japan's professional sumo circles, will be married to Miss Sumiko Koshiba, heiress of Osaka, at the Tokyo Kaikan on April 29, the Emperor's Birthday.
    The announcement of the engagement a month ago just about broke the hearts of thousands of feminine admirers of the Grand Champion.
    Futabayama is 27 and the bride to be 22.