was a Japanese freestyle swimmer who competed at the 1936 Olympics. He won a gold medal in 4 × 200 m freestyle relay, setting a world record. In the individual 100 m race, he finished almost simultaneously with Masanori Yusa and Masaharu Taguchi and was awarded a bronze medal. Those Games were the only international competition for Arai, though he won three national titles in the 100 m and four in the 200 m freestyle between 1937 and 1940.
While serving in the Imperial Japanese Army during World War II, he was killed in action in Burma.
See also List of members of the International Swimming Hall of Fame
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