Japanese Crown Prince Fumihito (far L) and his wife Crown Princess Kiko (2nd from L) visit a furniture workshop in Fiskars, a village in southern Finland, on July 4, 2019, during a trip to mark the 100th anniversary of diplomatic ties between the two countries. (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (2nd from L) and his wife Crown Princess Kiko (far L) visit a furniture workshop in Fiskars, a village in southern Finland, on July 4, 2019, during a trip to mark the 100th anniversary of diplomatic ties between the two countries. (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (far L) and his wife Crown Princess Kiko (2nd from L) visit a furniture workshop in Fiskars, a village in southern Finland, on July 4, 2019, during a trip to mark the 100th anniversary of diplomatic ties between the two countries. (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (2nd from L) and his wife Crown Princess Kiko (far L) visit a furniture workshop in Fiskars, a village in southern Finland, on July 4, 2019, during a trip to mark the 100th anniversary of diplomatic ties between the two countries. (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (far L) and his wife Crown Princess Kiko (2nd from R) visit a "neuvola" child care center in Espoo, Finland, on July 4, 2019, during a trip to celebrate the centenary of diplomatic ties between Japan and Finland. (Pool photo) (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (C) and his wife Crown Princess Kiko (R) meet a Japanese mother and her child in a "neuvola" child care center in Espoo, Finland, on July 4, 2019, during a trip to celebrate the centenary of diplomatic ties between Japan and Finland. (Pool photo) (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (2nd from R) and his wife Crown Princess Kiko (far R) visit a "neuvola" child care center in Espoo, Finland, on July 4, 2019, during a trip to celebrate the centenary of diplomatic ties between Japan and Finland. (Pool photo) (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (back R) and his wife Crown Princess Kiko (L of the crown prince) attend a concert in Jarvenpaa, Finland, on July 5, 2019, marking the 100th anniversary of the establishment of diplomatic ties between the two countries. Standing is pianist Izumi Tateno. (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (R) and his wife Crown Princess Kiko attend a concert in Jarvenpaa, Finland, on July 5, 2019, marking the 100th anniversary of the establishment of diplomatic ties between the two countries. (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (3rd from top R) and his wife Crown Princess Kiko (L of the crown prince) attend a concert in Jarvenpaa, Finland, on July 5, 2019, marking the 100th anniversary of the establishment of diplomatic ties between the two countries. (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (standing) speaks during a luncheon in Tuusula, Finland, on July 5, 2019, alongside his wife Crown Princess Kiko (L). (Kyodo via AP Images) ==Kyodo

Crown Prince Akishino (2R) and Crown Princess Kiko (R) of Japan visit Ainola, the Home of Aino and Jean Sibelius with Finnish Minister of Science and Culture Annika Saarikko (L), in Jarvenpaa, Finland, on July 5, 2019. During their four-day visit, Their Imperial Highnesses explore Finnish culture, landmarks, nature and healthcare. LEHTIKUVA / MIKKO STIG - FINLAND OUT. NO THIRD PARTY SALES.

Crown Prince Akishino (4L) and Crown Princess Kiko (3L) of Japan visit Ainola, the Home of Aino and Jean Sibelius with Finnish Minister of Science and Culture Annika Saarikko (3R), in Jarvenpaa, Finland, on July 5, 2019. During their four-day visit, Their Imperial Highnesses explore Finnish culture, landmarks, nature and healthcare. LEHTIKUVA / MIKKO STIG - FINLAND OUT. NO THIRD PARTY SALES.

Crown Prince Akishino and Crown Princess Kiko of Japan visit Ainola, the Home of Aino and Jean Sibelius, in Jarvenpaa, Finland, on July 5, 2019. During their four-day visit, Their Imperial Highnesses explore Finnish culture, landmarks, nature and healthcare. LEHTIKUVA / MIKKO STIG - FINLAND OUT. NO THIRD PARTY SALES.

Crown Prince Akishino and Crown Princess Kiko of Japan visit Ainola, the Home of Aino and Jean Sibelius, in Jarvenpaa, Finland, on July 5, 2019. During their four-day visit, Their Imperial Highnesses explore Finnish culture, landmarks, nature and healthcare. LEHTIKUVA / MIKKO STIG - FINLAND OUT. NO THIRD PARTY SALES.

Crown Prince Akishino (C) and Crown Princess Kiko (L) of Japan visit Ainola, the Home of Aino and Jean Sibelius with Finnish Minister of Science and Culture Annika Saarikko (R), in Jarvenpaa, Finland, on July 5, 2019. During their four-day visit, Their Imperial Highnesses explore Finnish culture, landmarks, nature and healthcare. LEHTIKUVA / MIKKO STIG - FINLAND OUT. NO THIRD PARTY SALES.

Crown Prince Akishino (2R) and Crown Princess Kiko (2L) of Japan visit Ainola, the Home of Aino and Jean Sibelius with Finnish Minister of Science and Culture Annika Saarikko (R), in Jarvenpaa, Finland, on July 5, 2019. During their four-day visit, Their Imperial Highnesses explore Finnish culture, landmarks, nature and healthcare. LEHTIKUVA / MIKKO STIG - FINLAND OUT. NO THIRD PARTY SALES.

Crown Prince Akishino and Crown Princess Kiko of Japan visit Ainola, the Home of Aino and Jean Sibelius, in Jarvenpaa, Finland, on July 5, 2019. During their four-day visit, Their Imperial Highnesses explore Finnish culture, landmarks, nature and healthcare. LEHTIKUVA / MIKKO STIG - FINLAND OUT. NO THIRD PARTY SALES.

Japanese Crown Prince Fumihito (2nd from R) and Finnish President Sauli Niinisto take a walk outside his official summer residence in Naantali, southwestern Finland, on July 3. Japanese Crown Princess Kiko (far L) and the finish president's wife Jenni Haukio can be seen behind them. (Kyodo via AP Images) ==Kyodo

Japanese Crown Prince Fumihito (2nd from R) and his wife Crown Princess Kiko (far R) are greeted by Finnish President Sauli Niinisto and his wife Jenni Haukio at his official summer residence in Naantali, southwestern Finland, on July 3, 2019. (Kyodo via AP Images) ==Kyodo

Japan's Crown Prince Akishino and Princess Kiko visit the Tomb of the Unknown Soldier in Helsinki, Finland on July 3, 2019. The Crown Prince and Princess are making a tour for Poland and Finland to commemorate the centenary ties with the EU countries. ( The Yomiuri Shimbun via AP Images )

Japan's Crown Princess Kiko, left, visits the Oodi Central Library with Children and Youth Service Manager of Helsinki Central Library Oodi Collection Laura Norris, right, in Helsinki, Finland, Thursday, July 4, 2019, during her four day visit to the country. (Emmi Korhonen/Lehtikuva via AP)

Japan's Crown Princess Kiko, background left, visits the Oodi Central Library with Children and Youth Service Manager of Helsinki Central Library Oodi Collection Laura Norris, background right, in Helsinki, Finland, Thursday, July 4, 2019, during her four day visit to the country. (Emmi Korhonen/Lehtikuva via AP)

Crown Prince Akishino and Crown Princess Kiko of Japan visit the workshop of Nikari, a wood design studio and furniture manufacturer, in the Fiskars Village in Raasepori, Finland, on Thursday July 4, 2019. (Heikki Saukomaa/Lehtikuva via AP)

Crown Prince Akishino and Crown Princess Kiko of Japan meet carpenter Minja Kolehmainen as they visit the workshop of Nikari, a wood design studio and furniture manufacturer, in the Fiskars Village in Raasepori, Finland, on Thursday July 4, 2019. (Heikki Saukomaa/Lehtikuva via AP)

Crown Prince Akishino and Crown Princess Kiko of Japan attend dinner hosted by Fiskars Village and Raasepori Town in Raasepori, Finland, on Thursday July 4, 2019. (Heikki Saukomaa/Lehtikuva via AP)

Crown Princess Kiko, with Crown Prince Akishino of Japan, attends dinner hosted by Fiskars Village and Raasepori Town in Raasepori, Finland, on Thursday July 4, 2019. (Heikki Saukomaa/Lehtikuva via AP)

Crown Prince Akishino (L) and Crown Princess Kiko (R) of Japan visit the Iso Omena maternity clinic in Espoo, Finland on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Emmi Korhonen / Lehtikuva / AFP) / Finland OUT

Crown Prince Akishino (R) and Crown Princess Kiko (L) of Japan attend a dinner hosted by Fiskars Village and Raasepori Town in Raasepori, Finland on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Mayor of Raasepori Ragnar Lundqvist (front L) addresses Crown Prince Akishino (R) and Crown Princess Kiko of Japan at a dinner hosted by Fiskars Village and Raasepori Town in Raasepori, Finland on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Crown Prince Akishino (R) and Crown Princess Kiko of Japan visit the workshop of Nikari, a wood design studio and furniture manufacturer, in the Fiskars Village in Raasepori, Finland, on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Crown Prince Akishino (R) and Crown Princess Kiko of Japan visit the workshop of Nikari, a wood design studio and furniture manufacturer, in the Fiskars Village in Raasepori, Finland, on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Crown Prince Akishino and Crown Princess Kiko of Japan speak with carpenter Minja Kolehmainen (R) as they visit the workshop of Nikari, a wood design studio and furniture manufacturer, in the Fiskars Village in Raasepori, Finland, on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Princess Kiko of Japan attends a dinner hosted by Fiskars Village and Raasepori Town in Raasepori, Finland on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Crown Prince Akishino and Crown Princess Kiko of Japan speak with carpenter Minja Kolehmainen and Nikari founder Kari Virtanen (R) as they visit the workshop of Nikari, a wood design studio and furniture manufacturer, in the Fiskars Village in Raasepori, Finland, on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Nikari founder Kari Virtanen (L) shows Crown Prince Akishino and Crown Princess Kiko of Japan around the workshop of Nikari, a wood design studio and furniture manufacturer, in the Fiskars Village in Raasepori, Finland, on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Nikari CEO Johanna Vuorio (2nd R) and Nikari founder Kari Virtanen (R) speak with Crown Prince Akishino and Crown Princess Kiko of Japan as they visit the workshop of Nikari, a wood design studio and furniture manufacturer, in the Fiskars Village in Raasepori, Finland, on July 4, 2019. - During their four-day visit, Japan's Crown Prince and his wife will explore Finnish culture, landmarks, nature and healthcare. (Photo by Heikki Saukkomaa / Lehtikuva / AFP) / Finland OUT

Crown Prince Akishino with Crown Princess Kiko of Japan attend the Finnish-Japanese diplomatic relations Centennial Anniversary Reception in Helsinki, Finland, Wednesday July 3, 2019. (Jussi Nukari/Lehtikuva via AP)

Crown Prince Akishino with Crown Princess Kiko of Japan attend the Finnish-Japanese diplomatic relations Centennial Anniversary Reception in Helsinki, Finland, Wednesday July 3, 2019. (Jussi Nukari/Lehtikuva via AP)