The silhouette of Japan's highest mountain Mount Fuji is seen beyond buildings in the dusk in Tokyo, Japan September 12, 2017. REUTERS/Issei Kato TPX IMAGES OF THE DAY 

Mount Fuji and the Imperial Japanese flag is painted on the tank of a Bousouzoku motorbike that is parked at the Dangouzaka rest stop in Yamanashi, west of Tokyo, Japan, January 3, 2016. Police on Sunday halted a group of about two dozen Bousouzoku bikers who paraded their noisy motorcycles during an annual New Year outing in the Mount Fuji region. This Japanese motorcycle subculture dates back in the 1950s and regularly chafes with the police because of their provocative traffic behaviour and bike customising, that is often deemed illegal. The sticker reads: "If you confront me, I will kill you". REUTERS/Thomas Peter 

Japan's Mount Fuji, surrounded by cloud, is seen from an airplane October 6, 2015. Mount Fuji, at 3,776 metres (12,388 ft) is Japan's highest mountain. REUTERS/Toru Hanai 

Japan's Mount Fuji, surrounded by clouds, is seen from an airplane October 6, 2015. Mount Fuji, at 3,776 metres (12,388 ft) is Japan's highest mountain. REUTERS/Toru Hanai TPX IMAGES OF THE DAY

Japan's Mount Fuji, surrounded by cloud, is seen from an airplane October 6, 2015. Mount Fuji, at 3,776 metres (12,388 ft) is Japan's highest mountain. REUTERS/Toru Hanai 

Mt. Fuji is seen from US Secretary of State John Kerry's plane as it flies over Japan while returning to the United States August 8, 2015. REUTERS/BRENDAN SMIALOWSKI/POOL 

Japan's Mount Fuji is seen covered with snow from an airplane December 5, 2013. Mount Fuji, at 3,776 metres (12,388 feet), is Japan's highest mountain and was granted UNESCO World Heritage site in June 2013. REUTERS/Issei Kato (JAPAN - Tags: ENVIRONMENT TRAVEL) 

Japanese Ground Self-Defense Force armoured tanks fire during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, August 20, 2013. REUTERS/Yuya Shino (JAPAN - Tags: MILITARY POLITICS TPX IMAGES OF THE DAY) 

The silhouette of Japan's highest mountain Mount Fuji (C) is seen beyond buildings in Tokyo December 12, 2012. Japan's economy contracted for a second straight quarter in July-September, revised government data showed on Monday, indicating that weak global demand nudged the export-reliant economy into a mild recession. REUTERS/Issei Kato (JAPAN - Tags: BUSINESS POLITICS CITYSCAPE) 

Tracer bullets ricochet off their targets as the Japanese Ground Self-Defence Force Type 74 and Type 90 armoured tanks fire machine guns during a night annual training session at Higashifuji training field in Gotemba, west of Tokyo, August 21, 2012. Mt. Fuji is seen in the background. REUTERS/Issei Kato (JAPAN - Tags: MILITARY TPX IMAGES OF THE DAY) 

Japan's Mount Fuji, covered with snow and surrounded by cloud, is seen from an airplane February 2, 2010. Mount Fuji, at 3,776 metres (12,388 ft) is Japan's highest mountain. REUTERS/Toru Hanai (JAPAN - Tags: TRAVEL ENVIRONMENT) 

Japan's Mount Fuji, covered with snow and surrounded by cloud, is seen from an airplane February 2, 2010. Mount Fuji, at 3,776 metres (12,388 ft) is Japan's highest mountain. REUTERS/Toru Hanai (JAPAN - Tags: TRAVEL ENVIRONMENT) 

Japan's Mount Fuji, covered with snow and surrounded by cloud, is seen from an airplane February 2, 2010. Mount Fuji, at 3,776 metres (12,388 ft) is Japan's highest mountain. REUTERS/Toru Hanai (JAPAN - Tags: TRAVEL ENVIRONMENT IMAGES OF THE DAY) 

A Japan Airlines aircraft flies past Mount Fuji near Haneda airport in Tokyo January 14, 2010. Japan Airlines will likely file for bankruptcy protection next week, sources with knowledge of the matter said, triggering losses for creditors and shareholders.
REUTERS/Toru Hanai (JAPAN - Tags: TRANSPORT BUSINESS IMAGES OF THE DAY) 

A man raises his hands and shouts "banzai" as he and others gather to watch the sunrise over Mount Fuji, which is known locally as "Diamond Fuji", from atop Ryugatake mountain in Fujikawaguchiko town, southwest of Tokyo January 1, 2010. Mount Fuji, at 3,776 metres (12,388 ft), is believed to be sacred and is seen as a symbol of good luck, more so during the New Year period. REUTERS/Yuriko Nakao (JAPAN - Tags: ENVIRONMENT IMAGES OF THE DAY) 

People take pictures of the sunrise appearing from the foot of Japan's highest mountain, Mount Fuji, in Fujikawaguchiko town, southwest of Tokyo December 31, 2009. Mount Fuji, at 3,776 metres (12,388 feet), is believed to be sacred and is seen as a symbol of good luck, especially during the New Year period. REUTERS/Yuriko Nakao (JAPAN - Tags: ENVIRONMENT SOCIETY IMAGES OF THE DAY) 

Pure gold artifact shaped as Japan's Mount Fuji by Japanese jewellery maker Ginza Tanaka is displayed during an unveiling in Tokyo December 15, 2009. The gold creation weighing 3 kg and sized at 6cm in height and 22cm in width will go on sale December 16. REUTERS/Yuriko Nakao (JAPAN - Tags: BUSINESS SOCIETY IMAGES OF THE DAY) 

People admire the moment the sun rises just above Mt. Fuji, which is known locally as the "Diamond Fuji", from atop Ryugatake mountain in Fujikawaguchiko town, west of Tokyo on New Year's Day January 1, 2009. REUTERS/Yuriko Nakao (JAPAN) 

Japan's highest mountain, Mt. Fuji, is seen through skyscrapers in Tokyo December 28, 2008. REUTERS/Yuriko Nakao (JAPAN) 

Mount Fuji is seen at dusk from downtown Tokyo February 18, 2008. REUTERS/Michael Caronna (JAPAN) 

Mount Fuji is pictured covered with snow and rising above lake Ashi in Hakone, Kanagawa Prefecture February 13, 2008. REUTERS/Michael Caronna (JAPAN) 

Mount Fuji is pictured covered with snow and rising above Lake Ashi in Hakone, Kanagawa Prefecture February 13, 2008. REUTERS/Michael Caronna (JAPAN) 

Mount Fuji is pictured covered with snow in Hakone, Kanagawa Prefecture February 13, 2008. REUTERS/Michael Caronna (JAPAN) 

A night view shows Japan's Mt. Fuji seen beyond high-rise buildings in Tokyo February 15, 2007. Japan's economy grew 1.2 percent in October-December from the previous quarter, government data showed on Thursday, beating market expectations, thanks to an upturn in personal consumption. REUTERS/Kim Kyung-Hoon (JAPAN) 

Visitors look at Japan's Mt. Fuji from an observatory in Tokyo February 15, 2007. Japan's economy grew 1.2 percent in October-December from the previous quarter, government data showed on Thursday, beating market expectations, thanks to an upturn in personal consumption. REUTERS/Kim Kyung-Hoon (JAPAN) 

The silhouette of Japan's highest Mt. Fuji is seen beyond Tokyo Tower in Tokyo November 24, 2006. REUTERS/Toru Hanai (JAPAN) 

A night view shows Japan's highest Mt. Fuji seen beyond Tokyo Tower and the Shiodome district in Tokyo November 24, 2006. REUTERS/Toru Hanai (JAPAN) 

South Korean FC Seoul's Jung Jo-gook (R) tackles Japanese FC Tokyo's Ryuji Fujiyama during the second half of their friendly soccer match at the Seoul World Cup stadium August 5, 2006. REUTERS/Lee Jae-Won (SOUTH KOREA) 

South Korean FC Seoul's Jung Jo-gook (top) fights for the ball with Japanese FC Tokyo's Ryuji Fujiyama during the second half of their friendly soccer match at the Seoul World Cup stadium August 5, 2006. REUTERS/Lee Jae-Won (SOUTH KOREA) 

Japanese FC Tokyo's Ryuji Fujiyama (L) challenges South Korean FC Seoul's Du Du during the second half of a friendly match at the Seoul World Cup stadium August 5, 2006. REUTERS/Lee Jae-Won (SOUTH KOREA) 

Japan's Mt Fuji, covered with snow, is seen through Shinjuku skyscrapers in Tokyo January 8, 2006. The recovery of Japan's economy has been helped by a strong recovery in exports and a rise in corporate profits that has filtered through to lower unemployment rates and raise incomes. The recovery has bolstered confidence in the stock market, where the Nikkei share average surged 40 percent in 2005. REUTERS/Kimimasa Mayama 

Japan's Mt Fuji, covered with snow, is seen through Shinjuku skyscrapers in Tokyo January 8, 2006. The recovery of Japan's economy has been helped by a strong recovery in exports and a rise in corporate profits that has filtered through to lower unemployment rates and raise incomes. The recovery has bolstered confidence in the stock market, where the Nikkei share average surged 40 percent in 2005. REUTERS/Kimimasa Mayama 

Japan's highest peak, Mt Fuji, stands tall over the skyscrapers of Tokyo's Shinjuku district in Tokyo November 27, 2004. The 3,776-metre peak is located in central Japan, about 110 km (68.75 miles) southwest of Tokyo. Photo taken November 27, 2004. REUTERS/Kimimasa Mayama KM/FA 

Japan's highest peak, Mt Fuji, is visible behind Shinjuku skyscrapers in Tokyo November 27, 2004. The 3,776-metre peak is located in central Japan, about 110km (68.75 miles) southwest of Tokyo. Photo taken November 27, 2004. REUTERS/Kimimasa Mayama KM/CN 

Japan's famous Mount Fuji is seen behind cherry blossoms in Fuji, central Japan April 7, 2003. Spring has once again brought the Japanese to indulge in the country's annual obsession of cherry blossom viewing. 

Japan's famous Mount Fuji is seen behind blooming national flower cherry
blossoms in Fuji, central Japan April 7, 2003. Spring has once again brought
the Japanese to indulge in the country's annual obsession of cherry blossom
viewing. Pictures of the month April 2003 REUTERS/Eriko Sugita ES/CC BEST QUALITY AVAILABLE 

Japan's famous Mount Fuji is seen behind cherry blossoms in Fuji, central
Japan April 7, 2003. Spring has once again brought the Japanese to indulge
in the country's annual obsession of cherry blossom viewing.
REUTERS/Eriko Sugita

ES/CC 

An aerial view shows Tokyo with Mount Fuji in the background January 4,
2003. About 12 million people live in the city, and about 33 million
people live in the metropolitan area which consists of Tokyo, Kanagawa,
Saitama and Chiba prefectures. REUTERS/Kimimasa Mayama

KM 

Skyscrapers in Tokyo's Shinjuku district frame Mt. Fuji at dusk December 11,
2002. At 3,776 metres (12,388 feet), Japan's highest peak is only about 100
km (62 miles) southwest of the capital. Picture taken December 11. RIGHTS
FREE REUTERS/Kimimasa Mayama PP03100126

KM/JD 

Skyscrapers in Tokyo's Shinjuku district frame Mt. Fuji at dusk
December 11, 2002. At 3,776 metres (12,388 feet), Japan's highest peak
is only about 100 km (62 miles) southwest of the capital. Picture taken
December 11. REUTERS/Kimimasa Mayama

KM/JD 

Argentina's Hernan Crespo (L) is challenged by Ryuji Fujiyama, of the
Japanese First Division soccer club FC Tokyo, during a warm-up match in
preparation for the 2002 FIFA World Cup, at the J-Village camp, in
Naraha, north of Tokyo, May 28, 2002. The Argentine team are in Group F
with Nigeria, England and Sweden in the first round of the World Cup
Finals which begin May 31 in Japan and South Korea. REUTERS/Enrique
Marcarian

EM/JDP 

Japan's symbolic Mount Fuji is seen in Oshino village, at the foot of
Fujiyama May 26, 2002. The country is jointly hosting Asia's first FIFA
World Cup with South Korea starting May 31, 2002. REUTERS/Eriko Sugita

ES/WS