Emperor Akihito Hosts Tea Party at the Imperial Palace on May 17, 2018 in Tokyo, Japan.

Emperor Akihito and Empress Michiko of Japan talk with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.

Japanese Emperor Akihito and Empress Michiko talk with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.

Emperor Akihito and Empress Michiko of Japan talk with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace in Tokyo, Japan on May 17, 2018.

Japan's Emperor Akihito and Empress Michiko followed by Crown Prince Naruhito and other royal members are seen on arrival at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.

(L-R) Crown Prince Naruhito, Princess Kiko of Akishino, Princess Mako of Akishino talk with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.

Emperor Akihito and Empress Michiko of Japan talk with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.

(L) Princess Kiko and Princess Mako of Akishino (C) talk with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.

(L-R) Princess Kiko and Princess Mako of Akishino talk with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.

Emperor Akihito of Japan talks with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.

Empress Michiko and Crown Prince Naruhito of Japan talk with guests at a tea party inviting leaders attending the Pacific Alliance Leaders Meeting at the Imperial Palace on May 17, 2018, in Tokyo, Japan.