 Complete the following phrase:  In 1976, when Yokoyama played for Mitsubishi Motors later Urawa Reds, he became a playing manager as Hiroshi Ninomiya successor. In 1978, the club won all three major titles in Japan; Japan Soccer League, JSL Cup and Emperors Cup. It was first domestic treble for a Japanese club. The club also won 1980 Emperors Cup, 1981 JSL Cup and 1982 Japan Soccer League. He resigned in 1984. In 1988, he became a manager for Japan national team as Yoshinobu Ishii successor, where he coached Japan in the countrys first competitive tournament, the 