横浜正金銀行
Two weeks before Ono's birth, Eisuke was transferred to San Francisco by his employer, the Yokohama Specie Bank. The rest of the family followed soon after, with Ono meeting her father when she was two. Her younger brother Keisuke was born in December 1936. Ono was enrolled in piano lessons from the age of 4. In 1937, the family was transferred back to Japan, and Ono enrolled at Tokyo's elite Gakushūin (also known as the Peers School), one of the most exclusive schools in Japan.