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Japan's Emperor Akihito (L) and Empress Michiko (2nd L) with members of the royal family attend the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017. The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

Japan's Emperor Akihito (L) and Empress Michiko (2nd L) with members of the royal family attend the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017. 
The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI        (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

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Japan's Emperor Akihito (front L) and Empress Michiko (front R) walk to greet guests during the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017. The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

Japan's Emperor Akihito (front L) and Empress Michiko (front R) walk to greet guests during the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017.
The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI        (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

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Japan's Emperor Akihito (front L) and Empress Michiko (front R) with members of the royal family walk to greet guests during the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017. The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

Japan's Emperor Akihito (front L) and Empress Michiko (front R) with members of the royal family walk to greet guests during the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017. 
The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI        (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

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Japan's Emperor Akihito (C) and Empress Michiko (L) greet table tennis player and Olympic medallist Ai Fukuhara (R) during the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017. The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

Japan's Emperor Akihito (C) and Empress Michiko (L) greet table tennis player and Olympic medallist Ai Fukuhara (R) during the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017.
The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI        (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

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Japan's Emperor Akihito (front L) and Empress Michiko (front R) walk to greet guests during the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017. The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)

Japan's Emperor Akihito (front L) and Empress Michiko (front R) walk to greet guests during the spring garden party at the Akasaka Palace imperial garden in Tokyo on April 20, 2017.
The Japanese royal family host garden parties annually, once in the spring and another in the autumn. / AFP PHOTO / Kazuhiro NOGI        (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images)