Sachiko, Princess Hisa was the second daughter and child of Emperor Shōwa and his wife, Empress Kōjun. Her personal name was Sachiko, and her title was Hisa-no-miya. Princess Shigeko was her older sister; her younger siblings were born after her death.

Hirohito, posthumously honored as Emperor Shōwa, was the 124th emperor of Japan, reigning from 1926 until his death in 1989. He was one of the longest-reigning monarchs in the world, with his reign of 62 years being the longest of any Japanese emperor.