Hiroko Masuhara (L) and her partner Koyuki Higashi take 'selfie' pictures in front of the statue of famous Japanese dog Hachiko after the ward office issued the nation's first same sex partnership certificates in Tokyo, Japan, November 5, 2015. The banner in the background is advertising the start of of the issuing of said certificates. REUTERS/Yuya Shino

Hiroko Masuhara (L) and her partner Koyuki Higashi, holding their partnership certificate, speak to the media outside the Shibuya ward office after the ward office issued the nation's first same sex partnership certificates in Tokyo, Japan, November 5, 2015. REUTERS/Yuya Shino 

Hiroko Masuhara (R) and her partner Koyuki Higashi, holding their partnership certificate, pose for pictures in front of the statue of famous Japanese dog Hachiko after the ward office issued the nation's first same sex partnership certificates in Tokyo, Japan, November 5, 2015. The banner in the background is advertising the start of of the issuing of said certificates. REUTERS/Yuya Shino

Hiroko Masuhara (L) and her partner Koyuki Higashi hold their partnership certificate as they pose for pictures outside the Shibuya ward office after the ward office issued the nation's first same sex partnership certificates in Tokyo, Japan, November 5, 2015. REUTERS/Yuya Shino 

Hiroko Masuhara (L) and her partner Koyuki Higashi hold their partnership certificate as they walk out from the Shibuya ward office after the ward office issued the nation's first same sex partnership certificates in Tokyo, Japan, November 5, 2015. REUTERS/Yuya Shino TPX IMAGES OF THE DAY

Japan's Prime Minister Shinzo Abe (L) poses with Japanese comedy duos '8.6 second bazooka' member Ryota Hamaya (2nd L) and Shin Tanaka (3rd L) and kimono-clad 'Japan erekiteru union' member Koyuki Hashimoto (2nd R) and Souko Nakano at a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo April 18, 2015. Thousands of people including entertainers, athletes and politicians were invited to the annual party hosted by Abe. REUTERS/Issei Kato

Japanese actress Koyuki poses during a promotional event for a cosmetics brand in Tokyo January 26, 2010. REUTERS/Yuriko Nakao (JAPAN - Tags: ENTERTAINMENT HEADSHOT) 

Japanese actress Koyuki attends a promotional event for a cosmetics brand in Tokyo January 26, 2010. REUTERS/Yuriko Nakao (JAPAN - Tags: ENTERTAINMENT HEADSHOT) 

Japanese actress Koyuki arrives for an unveiling of Panasonic's new Viera 1080p full high-definition TVs in Tokyo August 9, 2007. Panasonic brand maker Matsushita Electric Industrial Co. Ltd introduced seven new Viera TV's including six plasma TV's with screen size ranging from 42 inches diagonal to 65 inches and one LCD TV with 37 inches diagonal screen. REUTERS/Yuriko Nakao (JAPAN) 

Japanese actress Koyuki arrives for an unveiling of Panasonic's new Viera 1080p full high-definition TVs in Tokyo August 9, 2007. Panasonic brand maker Matsushita Electric Industrial Co. Ltd introduced seven new Viera TV's including six plasma TV's with screen size ranging from 42 inches diagonal to 65 inches and one LCD TV with 37 inches diagonal screen. REUTERS/Yuriko Nakao (JAPAN) 

A sex doll named "Koyuki" is displayed at Orient Industry's showroom in Tokyo May 23, 2007. Orient Industry makes sex dolls to order with a variety of bodies, faces and hairstyles that cost from 140,000 yen (US$1,150) for a basic model to 650,000 yen (US$5,400) for models with realistic latex skin and internal metal skeletons.REUTERS/Michael Caronna (JAPAN) 

A sex doll called "Koyuki" is displayed at Orient Industry's showroom in Tokyo May 23, 2007. Orient Industry makes sex dolls to order with a variety of bodies, faces and hairstyles that cost from 140,000 yen (US$1,150) for a basic model to 650,000 yen (US$5,400) for models with realistic latex skin and internal metal skeletons.REUTERS/Michael Caronna (JAPAN) 

Japanese actress Koyuki stands next to Panasonic's new 1080p resolution Viera 50-inch plasma televisions 'TH-50PZ700SK' during its launch event in Tokyo April 10, 2007. REUTERS/Kiyoshi Ota (JAPAN) 

Japanese actress Koyuki stands next to a Panasonic 103-inch plasma TV, the world's largest, during a launch event of its new plasma TVs in Tokyo July 19, 2006. Panasonic brand maker Matsushita Electric Industrial Co. Ltd. will start taking orders in Japan for the 103-inch plasma TV, priced at around 6 million yen ($50,000), on September 1, the company said on Wednesday. REUTERS/Kiyoshi Ota (JAPAN) 

Toyota Motor Corporation President Fujio Cho (C) poses with Japanese actress Koyuki (R) and actor Toshiyuki Karasawa beside the company's new medium-class minivan "Isis" during an unveiling in Tokyo September 28, 2004. The "Isis" was launched in Japan on Tuesday for a price starting from 1.785 million yen ($15,994). Koyuki and Karasawa were selected by Toyota as the new minivan's image characters. REUTERS/Issei Kato IK/CP 

Japanese actress Koyuki arrives at the U.S. premiere of her film 'The Last Samurai' in Los Angeles, December 1, 2003. The film opens in the U.S. December 5. 

Japanese actress Koyuki arrives at the U.S. premiere of her film 'The Last Samurai' in Los Angeles, December 1, 2003. The film opens in the U.S. December 5. 

Actor Tom Cruise (2nd R) is joined by fellow cast members, from left, Shin
Koyamada, Ken Watanabe, Tony Goldwyn, Koyuki, Billy Connolly, Cruise and
Hiroyuki Sanada at the U.S. premiere of the film "The Last Samurai" in Los
Angeles December 1, 2003. The picture opens in the U.S. on December 5.
REUTERS/Robert Galbraith PP03120006

RG 

Cast member Tom Cruise (L) joins fellow star Koyuki at the U.S. premiere of
the film "The Last Samurai" in Los Angeles December 1, 2003. The picture
opens in the U.S. on December 5. REUTERS/Robert Galbraith PP03120006

RG/GAC 

Japanese actress Koyuki arrives at the U.S. premiere of her film 'The
Last Samurai' in Los Angeles, December 1, 2003. The film opens in the
U.S. December 5. REUTERS/Lucy Nicholson

LN 

Japanese actress Koyuki arrives at the U.S. premiere of her film 'The Last
Samurai' in Los Angeles, December 1, 2003. The film opens in the U.S.
December 5. REUTERS/Lucy Nicholson PP03120006

LN/GAC 

Hollywood actor Tom Cruise (C) smiles with director Edward Zwick (L)
and Japanese co-stars Ken Watanabe (2nd-L), Hiroyuki Sanada (2nd-R) and
Koyuki at a news conference at Nijo Castle in Kyoto, Japan November 21,
2003. Cruise is in the ancient Japanese capital for a premiere of his
new film "The Last Samurai," coming to theatres in Japan in December.
REUTERS/Eriko Sugita

ES/FA 

Hollywood actor Tom Cruise (C) smiles with director Edward Zwick (L)
and Japanese co-stars Ken Watanabe (2nd-L), Hiroyuki Sanada (2nd-R) and
Koyuki at a news conference at Nijo Castle in Kyoto, Japan at the
premiere of their film "The Last Samurai" November 21, 2003. Kyoto is
one of the cities featured in "The Last Samurai", coming to theatres in
Japan in December. REUTERS/Eriko Sugita

ES/FA 

Hollywood actor Tom Cruise (C) is flanked by Japanese co-star Ken
Watanabe (2nd R), Japanese actress Koyuki (R), Director Edward Zwick
(L) and Japanese actor Hiroyuki Sanada during a news conference
promoting their film 'The Last Samurai' in Tokyo November 20, 2003. The
movie will be released in Japan on December 6. REUTERS/Haruyoshi
Yamaguchi

HY/TW