Saito began judo in junior-high school, and in 1974, he was scouted to transfer to the Kokushikan junior-high school, located in Setagaya, Tokyo.
He moved to Tianjin in 1944 before returning to Japan in 1950, settling in Setagaya, Tokyo.
Nishimura attended Kokushikan University in Setagaya, Tokyo from 1997 to 2000, winning the All-Japan Prime Minister Cup.
A native of Setagaya, Tokyo and graduate of Tamagawa University, he was elected to the House of Councillors for the first time in 1999.
In 1997 he was part of a hand-selected cast for the Japan-Thai Contemporary Theatre Joint Production of Red Demon in a joint production of the Japan Foundation and the Setagaya Public Theatre.
From February 27, 1907 until his death, he lived in a house in Musashino (Setagaya, Tokyo, Japan).
A native of Setagaya, Tokyo, Satō received a bachelor's degree from Sophia University, a master's degree in international relations from Columbia University, and a Ph.D in economics from the New York University.