Crown Prince Haakon of Norway, Crown Princess Mette Marit, Crown Prince Fumihito of Japan and Crown Princess Kiko of Japan at the coronation of King Charles III and Queen Camilla at Westminster Abbey, London. Picture date: Saturday May 6, 2023. Andrew Matthews/Pool via REUTERS 

Crown Prince Fumihito and Crown Princess Kiko of Japan arrive to attend Britain's King Charles and Queen Camilla's coronation ceremony at Westminster Abbey, in London, Britain May 6, 2023. REUTERS/Phil Noble/Pool 

Japan's Crown Prince Fumihito and Crown Princess Kiko walk outside Westminster Abbey ahead of Britain's King Charles' coronation ceremony, in London, Britain May 6, 2023. REUTERS/Lisi Niesner 

Crown Prince Fumihito of Japan and Crown Princess Kiko arrive to attend Britain's King Charles and Queen Camilla coronation ceremony at Westminster Abbey, in London, Britain May 6, 2023. REUTERS/Toby Melville/Pool 

Crown Prince Fumihito of Japan and Crown Princess Kiko arrive to attend Britain's King Charles and Queen Camilla coronation ceremony at Westminster Abbey, in London, Britain May 6, 2023. REUTERS/Toby Melville/Pool 

Crown Prince Fumihito and Crown Princess Kiko of Japan arrive to attend Britain's King Charles and Queen Camilla's coronation ceremony at Westminster Abbey, in London, Britain May 6, 2023. REUTERS/Phil Noble/Pool 

Crown Prince Fumihito and Crown Princess Kiko of Japan arrive to attend Britain's King Charles and Queen Camilla's coronation ceremony at Westminster Abbey, in London, Britain May 6, 2023. REUTERS/Phil Noble/Pool 

Crown Prince Fumihito and Crown Princess Kiko of Japan arrive to attend Britain's King Charles and Queen Camilla's coronation ceremony at Westminster Abbey, in London, Britain May 6, 2023. REUTERS/Henry Nicholls 

Crown Prince Fumihito and Crown Princess Kiko of Japan arrive to attend Britain's King Charles and Queen Camilla's coronation ceremony at Westminster Abbey, in London, Britain May 6, 2023. REUTERS/Henry Nicholls 

Japanese Crown Prince Fumihito and Crown Princess Kiko arrive to Britain's King Charles' reception at Buckingham Palace in London, Britain May 5, 2023 REUTERS/Henry Nicholls 

Japanese Crown Prince Fumihito and Crown Princess Kiko arrive to Britain's King Charles' reception at Buckingham Palace in London, Britain May 5, 2023 REUTERS/Henry Nicholls 

Japanese Crown Prince Fumihito and Crown Princess Kiko arrive to Britain's King Charles' reception at Buckingham Palace in London, Britain May 5, 2023 REUTERS/Henry Nicholls 

TOKYO, JAPAN - FEBRUARY 23: (From R) Japanese Crown Prince Fumihito, Crown Princess Kiko and Princess Kako greet the public on Emperor Naruhito's birthday on February 23, 2023 in Tokyo, Japan. Takashi Aoyama/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Crown Prince Fumihito of Akishino and Crown Princess Kiko of Akishino attend the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino and Princess Kako of Akishino wave during the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Princess Akiko of Mikasa, Princess Nobuko of Mikasa, Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino, Princess Kako of Akishino, Princess Hisako of Takamado and Princess Tsuguko of Takamado wave during the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino and Princess Kako of Akishino attend the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino, Princess Kako of Akishino, Princess Yuriko of Mikasa, Princess Nobuko of Mikasa and Princess Akiko of Mikasa wave during the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: (L-R) Princess Tsuguko of Takamado, Princess Hisako of Takamado, Princess Hanako of Hitachi, Prince Hitachi, Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino, Princess Kako of Akishino, Princess Yuriko of Mikasa, Princess Nobuko of Mikasa and Princess Akiko of Mikasa during the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

Crown Prince Fumihito leaves the Imperial Palace after being formally declared first in line to the Chrysanthemum Throne during a ceremony in which Emperor Naruhito proclaimed his younger brother "Crown Prince to the People of Japan" in Tokyo, Japan, November 8, 2020. Carl Court/Pool via REUTERS 

Crown Prince Fumihito leaves the Imperial Palace after being formally declared first in line to the Chrysanthemum Throne during a ceremony in which Emperor Naruhito proclaimed his younger brother "Crown Prince to the People of Japan" in Tokyo, Japan, November 8, 2020. Carl Court/Pool via REUTERS 

Crown Prince Fumihito leaves the Imperial Palace after being formally declared first in line to the Chrysanthemum Throne during a ceremony in which Emperor Naruhito proclaimed his younger brother "Crown Prince to the People of Japan" in Tokyo, Japan, November 8, 2020. Carl Court/Pool via REUTERS 

Crown Prince Fumihito leaves the Imperial Palace after being formally declared first in line to the Chrysanthemum Throne during a ceremony in which Emperor Naruhito proclaimed his younger brother "Crown Prince to the People of Japan" in Tokyo, Japan, November 8, 2020. Carl Court/Pool via REUTERS 

Crown Prince Fumihito leaves the Imperial Palace after being formally declared first in line to the Chrysanthemum Throne during a ceremony in which Emperor Naruhito proclaimed his younger brother "Crown Prince to the People of Japan" in Tokyo, Japan, November 8, 2020. Carl Court/Pool via REUTERS 

Crown Prince Fumihito leaves the Imperial Palace after being formally declared first in line to the Chrysanthemum Throne during a ceremony in which Emperor Naruhito proclaimed his younger brother "Crown Prince to the People of Japan" in Tokyo, Japan, November 8, 2020. Carl Court/Pool via REUTERS 

Crown Prince Fumihito leaves the Imperial Palace after being formally declared first in line to the Chrysanthemum Throne during a ceremony in which Emperor Naruhito proclaimed his younger brother "Crown Prince to the People of Japan" in Tokyo, Japan, November 8, 2020. Carl Court/Pool via REUTERS 

Crown Prince Fumihito leaves the Imperial Palace after being formally declared first in line to the Chrysanthemum Throne during a ceremony in which Emperor Naruhito proclaimed his younger brother "Crown Prince to the People of Japan" in Tokyo, Japan, November 8, 2020. Carl Court/Pool via REUTERS 

Japan's Emperor Akihito (L), flanked by Empress Michiko (2nd L), leads his royal family members Crown Prince Naruhito (4th R), Crown Princess Masako (R), Prince Akishino (behind Naruhito), Princess Kiko (behind Masako) and their daughter Princess Mako to greet guests during the annual spring garden party at the Akasaka Palace imperial garden in Tokyo, Japan, April 27, 2016. REUTERS/Issei Kato/File photo 

Pope Francis walks with Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini TPX IMAGES OF THE DAY

Pope Francis talks with Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francis walks with Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini TPX IMAGES OF THE DAY

Pope Francis exchanges gifts with Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francis exchanges gifts with Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francis greets Japan's Prince Akishino (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francis poses with Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francis poses with Japan's Prince Akishino (L) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francis exchanges gifts with Japan's Prince Akishino (L) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francisposes with Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francis walks next Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Pope Francis talks with Japan's Prince Akishino (L) and his wife Princess Kiko (R) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Japan's Prince Akishino (L) talks with Pope Francis during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Japan's Prince Akishino (L) talks with Pope Francis during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Japan's Prince Akishino and his wife Princess Kiko (R) talk with Pope Francis (L) during a meeting at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Japan's Prince Akishino (C) and his wife Princess Kiko (R) arrive to attend a meeting with Pope Francis at the Vatican May 12, 2016. REUTERS/Stefano Rellandini 

Japan's Emperor Akihito (L), flanked by Empress Michiko (2nd L), makes an appearance before guests with his royal family members Crown Prince Naruhito (5th R), Crown Princess Masako (4th R), Prince Akishino (3rd R), Princess Kiko (2nd R) and their daughter Princess Mako during the annual spring garden party at the Akasaka Palace imperial garden in Tokyo, Japan, April 27, 2016. REUTERS/Issei Kato TPX IMAGES OF THE DAY

Japan's Emperor Akihito (L), flanked by Empress Michiko (2nd L), leads his royal family members Crown Prince Naruhito (4th R), Crown Princess Masako (R), Prince Akishino (behind Naruhito), Princess Kiko (behind Masako) and their daughter Princess Mako to greet guests during the annual spring garden party at the Akasaka Palace imperial garden in Tokyo, Japan, April 27, 2016. REUTERS/Issei Kato 

Japan's Crown Prince Naruhito (R) and and his wife Crown Princess Masako (C) talk with Prince Akishino as they see Emperor Akihito and Empress Michiko off at Tokyo's Haneda Airport, Japan, January 26, 2016. Emperor Akihito and Empress Michiko left for the Philippines for a five-day state visit. REUTERS/Toru Hanai

Japan's Prince Akishino (R) and his wife Princess Kiko wave as they see Emperor Akihito and Empress Michiko off at Tokyo's Haneda Airport, Japan, January 26, 2016. Emperor Akihito and Empress Michiko left for the Philippines for a five-day state visit. REUTERS/Toru Hanai

Japan's Crown Prince Naruhito (R) and his wife Crown Princess Masako (2nd R), and Prince Akishino (2nd L) and his wife Princess Kiko wave as they see Emperor Akihito and Empress Michiko off at Tokyo's Haneda Airport, Japan, January 26, 2016. Emperor Akihito and Empress Michiko left for the Philippines for a five-day state visit. REUTERS/Toru Hanai

Japan's Emperor Akihito (L) and Empress Michiko (2nd L) talk with Crown Prince Naruhito (C), Crown Princess Masako (2nd R) and Prince Akishino before boarding a special flight for their visit to the Philippines at Tokyo's Haneda Airport, Japan, January 26, 2016. REUTERS/Toru Hanai

Japan's Crown Prince Naruhito (3rd L) and Crown Princess Masako (4th L) greet guests with Prince Akishino (4th R), Princess Kiko (2nd R) and their daughter Princess Mako (R), during the annual autumn garden party hosted by Emperor Akihito and Empress Michiko (not in picture) at the Akasaka Palace imperial garden in Tokyo November 12, 2015. Crown Princess Masako took part in the garden party for the first time since the autumn party in 2003. REUTERS/Toru Yamanaka/Pool

Japan's Prince Akishino points next to his wife Princess Kiko during a visit to the Sugarloaf Mountain in Rio de Janeiro, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares 

Japan's Prince Akishino takes a photo during his visit to the Rio de Janeiro Botanic Garden, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares 

Japan's Prince Akishino gestures (C) as passes by a Brazilian tree Pau Brasil during a visit to the Rio de Janeiro Botanic Garden, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares 

Japan's Prince Akishino and his wife Princess Kiko visit the Rio de Janeiro Botanic Garden, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares 

Japan's Princess Kiko visits the Rio de Janeiro Botanic Garden, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares 

Japan's Prince Akishino and his wife Princess Kiko visit the Sugarloaf Mountain in Rio de Janeiro, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares 

Japan's Prince Akishino and his wife Princess Kiko poses in front of the Sumauma tree at the Rio de Janeiro Botanic Garden, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares 

Japan's Prince Akishino kneels to take a photo of the Sumauma tree, accompanied by his wife Princess Kiko, at the Rio de Janeiro Botanic Garden, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares 

Japan's Prince Akishino and his wife Princess Kiko pose in front of the Sumauma tree at the Rio de Janeiro Botanic Garden, Brazil, November 8, 2015. Prince Akishino and Princess Kiko are on a 12-day official visit to Brazil to celebrate 120 years of friendship between Japan and Brazil. REUTERS/Pilar Olivares TPX IMAGES OF THE DAY