Seta was born in Morioka on January 15, 1952. After graduating from high school, he joined Hitachi in 1970. In 1972, the club won the champions in Japan Soccer League and Emperor's Cup. The club also won 1975 Emperor's Cup and 1976 JSL Cup. He retired in 1980. He played 164 games in the league. He was elected Best Eleven in 1972 and 1976. In 1982, he came back as playing-coach, but he did not play in the match. He retired again in 1986.