Atsuko Ikeda , formerly Atsuko, Princess Yori , is the fourth daughter of Emperor Shōwa and Empress Kōjun. As such, she is the older sister of Emperor Emeritus Akihito and paternal aunt of Emperor Naruhito. She married Takamasa Ikeda on 10 October 1952. As a result, she gave up her imperial title and left the Japanese Imperial Family, as required by law. Later, she served as the most sacred priestess (saishu) of the Ise Grand Shrine between 1988 and 2017. In April 2024 the former princess adopted Motohiro Nozu CEO of Kabaya.

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.