Hisakichi Toyoda was born on the island of Suo-Oshima. He later changed his name to Minejima. His gold in the 4x200 m freestyle relay in 1932 was the first gold medal for an athlete from Nihon University and from Yamaguchi prefecture. In 1936 he played under the screen name Mitsuru Toyoda in several films for the Japanese film company Shochiku. After World War II, Toyoda became a swimming teacher and director of the physical education department at a high school in Fujisawa, where he was able to have an up-to-date swimming pool donated to the school. At the age of 64, he suddenly died while teaching swimming. He was the grandfather of three-time Olympian and breaststroker Kenji Watanabe.