An old toilet is displayed during the “Toilet!? Human Waste and Earth's Future” exhibition at The National Museum of Emerging Science and Innovation – Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images)

A Japanese girl poses in a costume at a Chara Fes (character festival) event on October 26, 2003 in Tokyo. Cosplay (costume play) is becoming popular among Japanese youths, whereby participants dress up as their favourite characters from comics, computer games and animation. (Photo by Junko Kimura/Getty Images)

A model presents the Flesby, a one-seater mobility concept car, during a media preview of the 45th Tokyo Motor Show in Tokyo, Japan on October 25, 2017. Japan's flagship automakers present their futuristic visions for the post-fossil fuel era at the Tokyo Motor Show that kicks off Wednesday. (Photo by Kim Kyung-Hoon/Reuters)

Young Japanese women pose with a green bear costumed person during the 'Earth Parade 2015' in Tokyo, Japan, Saturday, November 28, 2015. Ahead of the U.N. climate change summit in Paris starting this week, about 1,000 citizens and environmental activists took to the streets of Tokyo on Saturday, calling for strong actions to combat global warming. (Photo by Franck Robichon/EPA)

A woman looks at jellyfish during a media preview for the Epson Aqua Park Shinagawa aquarium's re-opening in Tokyo July 6, 2015. The aquarium will re-open on July 10 with new attractions including a pirate ship ride and a merry-go-round. (Photo by Toru Hanai/Reuters)

Tokyo DisneySea at Urayasu, Chiba prefecture, is holding Christmas festivities each night until December 25, 2012. At neighboring Tokyo Disneyland, the Christmas Fantasy parade is held twice daily at the theme park. (Photo by Disneyland)

In this April 28, 2015 file photo, heads of tuna on a cart are carried by a fish dealer after the day's auction at Tsukiji Wholesale Market in Tokyo. In one of the biggest of Japan's many New Year holiday rituals, early on Tuesday, January 5, 2016, Tokyo's Tsukiji market will auction off with much fanfare a huge, glistening tuna, likely destined for one of the big sushi chains. If all goes as planned, it will be the last such auction at 80-year-old Tsukiji. (Photo by Shuji Kajiyama/AP Photo)

Twenty-year-old women draped in traditional kimonos gather for their “Coming-of-Age Day” ceremony at the Tokyo Disneyland in Urayasu, eastern suburb of Tokyo on January 13, 2020. (Photo by Kazuhiro Nogi/AFP Photo)