FILE- Japan's Princess Aiko greets guests during the spring garden party at the Akasaka Palace imperial garden Tuesday, April 23, 2024, in Tokyo. (AP Photo/Eugene Hoshiko, File)
In this photo provided by Japan's Imperial Household Agency of Japan, Prince Hisahito, the son of Crown Prince Akishino and Crown Princess Kiko, is pictured at the Akasaka Palace imperial garden in Tokyo, July 15, 2024. Hisahito turned 18 on Friday, Sept. 6. (Imperial Household Agency of Japan via AP)
FILE - Japan's Prince Akishino, left, and his wife Princess Kiko, carrying their son Prince Hisahito, are welcomed by the staff of an imperial ranch in Takanezawa, north of Tokyo, March 28, 2008. (AP Photo/Koji Sasahara, File)
FILE- Japan's Emperor Naruhito, from left, Empress Masako and their daughter Princess Aiko wave to well-wishers from the balcony of the Imperial Palace in Tokyo on Friday, Feb. 23, 2024. (Tomohiro Ohsumi/Pool Photo via AP)
FILE - Japan's newborn Prince Hisahito sleeps in the arms of his mother Crown Princess Kiko as he leaves a Tokyo hospital Sept. 15, 2006. (AP Photo/Itsuo Inouye, Pool, File)
FILE - Japan's Prince Hisahito, wearing a traditional ceremonial attire, is accompanied by his parents, Prince Akishino, Princess Kiko, his sisters Princess Mako, left, and Princess Kako, right, after attending "Chakko-no-gi" ceremony to celebrate his growth and the passage from infancy to childhood, at the Akasaka imperial estate in Tokyo, Nov. 3, 2011. (AP Photo/Issei Kato, Pool, File)