FILE PHOTO : Tokyo Governor Yuriko Koike, head of Japan's Party of Hope, attends a news conference at the Japan National Press Club in Tokyo, Japan

FILE PHOTO : Tokyo Governor Yuriko Koike, head of Japan’s Party of Hope, attends a news conference at the Japan National Press Club in Tokyo, Japan

Tokyo Governor Yuriko Koike, head of Japan's Party of Hope, at a news conference at the Japan National Press Club in Tokyo, Japan September 28, 2017. REUTERS/Kim Kyung-Hoon

October 2, 2017 7:45 PM (UTC+8)