Naomi Hirahara was born in Pasadena, California. Her father, Isamu (known as "Sam"), was also born in California, but was taken to Hiroshima, Japan, as an infant. He was only miles away from the epicenter of the atomic-bombing in 1945, yet survived. Naomi's mother, Mayumi, or "May," was born in Hiroshima and lost her father in the blast. Shortly after the end of World War II, Sam returned to California and eventually established himself in the gardening and landscaping trade in the Los Angeles area. After Sam married May in Hiroshima in 1960, the couple made their new home in Altadena and then South Pasadena, where Naomi and her younger brother Jimmy grew up and attended secondary school.