A motorcade carrying Japan's Emperor Naruhito and Empress Masako rides during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Issei Kato

Well-wishers watch the royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

Well-wishers watch the royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

A man carrying Japan's national flag walks past security guards as he attends Japan's Emperor Naruhito and Empress Masako's royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito (not seen in the picture) and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

Well-wishers watch the royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

A motorcade carrying Japan's Emperor Naruhito and Empress Masako rides during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Issei Kato

A motorcade carrying Japan's Emperor Naruhito and Empress Masako rides during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito rides in a car during the royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

A motorcade carrying Japan's Emperor Naruhito and Empress Masako rides during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

A motorcade carrying Japan's Emperor Naruhito and Empress Masako rides during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

A motorcade carrying Japan's Emperor Naruhito and Empress Masako rides during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Issei Kato

A motorcade carrying Japan's Emperor Naruhito and Empress Masako rides during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Hong-Ji

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako ride in a car during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon TPX IMAGES OF THE DAY

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Japan's Emperor Naruhito and Empress Masako wave to well-wishers during their royal parade to mark the enthronement of Japanese Emperor Naruhito in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-Hoon

Honour guards make their way to the Imperial Palace ahead of a royal parade by Japan's Emperor Naruhito and Empress Masako, in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-hoon

People wait ahead of a royal parade by Japan's Emperor Naruhito and Empress Masako, in front of the Imperial Palace in Tokyo, Japan, November 10, 2019. REUTERS/Kim Hong-ji

People wait for the start of a royal parade by Japan's Emperor Naruhito and Empress Masako, in front of the Imperial Palace in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-hoon

People wait for the start of a royal parade by Japan's Emperor Naruhito and Empress Masako, in front of the Imperial Palace in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-hoon

A child waves a Japan flag as people wait for the start of a royal parade by Japan's Emperor Naruhito and Empress Masako, in front of the Imperial Palace in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-hoon

People wait for the start of a royal parade by Japan's Emperor Naruhito and Empress Masako, in front of the Imperial Palace in Tokyo, Japan November 10, 2019. REUTERS/Kim Kyung-hoon