Mimaki was born in
Itabashi,
Tokyo in March 1942—his parents had married in January of 1941. In April 1945, Mimaki's family evacuated from the Tokyo metropolis to his father's hometown,
Hiroshima, specifically Imuro village near the Utsu railroad crossing. On August 6, 1945, he witnessed the
atomic bombing of the city. After the atomic bombing, Mimaki and his mother searched for his father in the city—he had been missing after leaving for work. On August 8, the three of them reunited. Afterward, Mimaki's family relocated to
Kumagaya in
Saitama Prefecture, then later to
Yamagata Prefecture. Later, in elementary school, Mimaki contracted a fever that was speculated to have been the result of
radiation sickness. With
streptomycin, he was able to recover. Mimaki then normally went about middle school and high school, after which he became a
lathe operator. == Career ==