New chief executive of Mizuho Trust and Banking Kei Umeda speaks during an interview with Reuters in Tokyo, Japan April 1, 2020. Picture taken April 1, 2020. REUTERS/Takashi Umekawa 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai attends an interview with Reuters at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai poses for a photo after an interview with Reuters at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai attends an interview with Reuters as Bank of Japan buildings are seen at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai attends an interview with Reuters at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai attends an interview with Reuters at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai attends an interview with Reuters at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai poses for a photo after an interview with Reuters at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai attends an interview with Reuters at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's Chief Executive Officer Tatsufumi Sakai attends an interview with Reuters as Bank of Japan buildings are seen at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group logo is seen at the company's headquarters in Tokyo, Japan August 20, 2018. Picture taken August 20, 2018. REUTERS/Toru Hanai 

A man walks past signboards of Sumitomo Mitsui Banking Corporation (R), Mizuho Bank (3rd L), MUFG Bank (2nd L), and Resona Bank in Tokyo, Japan April 3, 2018. REUTERS/Toru Hanai 

A man walks past signboards of Japan's three mega banks, Sumitomo Mitsui Banking Corporation (R), Mizuho Bank (C), and MUFG Bank in Tokyo, Japan April 3, 2018. REUTERS/Toru Hanai 

Mizuho Financial Group's incoming chief executive officer Tatsufumi Sakai is seen through laptops at a news conference in Tokyo, Japan January 15, 2018. REUTERS/Kim Kyung-Hoon 

Mizuho Financial Group's incoming chief executive officer Tatsufumi Sakai speaks at a news conference in Tokyo, Japan January 15, 2018. REUTERS/Kim Kyung-Hoon 

Mizuho Financial Group's outgoing chief executive officer Yasuhiro Sato speaks at a news conference in Tokyo, Japan January 15, 2018. REUTERS/Kim Kyung-Hoon 

Mizuho Financial Group's incoming chief executive officer Tatsufumi Sakai and outgoing chief executive officer Yasuhiro Sato arrive for their news conference in Tokyo, Japan January 15, 2018. REUTERS/Kim Kyung-Hoon 

Mizuho Financial Group's incoming chief executive officer Tatsufumi Sakai and outgoing chief executive officer Yasuhiro Sato are seen during the news conference in Tokyo, Japan January 15, 2018. REUTERS/Kim Kyung-Hoon 

Mizuho Financial Group's incoming chief executive officer Tatsufumi Sakai speaks at a news conference in Tokyo, Japan January 15, 2018. REUTERS/Kim Kyung-Hoon 

A woman uses an ATM machine of Mizuho bank as a man buys a drink from a vending machine in Tokyo, Japan, September 7, 2017. REUTERS/Toru Hanai 

A man uses an ATM machine of Mizuho bank in Tokyo, Japan September 5, 2017. REUTERS/Kim Kyung-Hoon 

Koji Fujiwara, President and CEO of Mizuho Bank, core banking unit of Mizuho Financial Group, attends an interview with Reuters at the bank's headquarters in Tokyo, Japan, April 19, 2017. Picture taken April 19, 2017. REUTERS/Toru Hanai 

Koji Fujiwara, President and CEO of Mizuho Bank, core banking unit of Mizuho Financial Group, attends an interview with Reuters at the bank's headquarters in Tokyo, Japan, April 19, 2017. Picture taken April 19, 2017. REUTERS/Toru Hanai 

Koji Fujiwara, President and CEO of Mizuho Bank, core banking unit of Mizuho Financial Group, attends an interview with Reuters at the bank's headquarters in Tokyo, Japan, April 19, 2017. Picture taken April 19, 2017. REUTERS/Toru Hanai 

Koji Fujiwara, President and CEO of Mizuho Bank, core banking unit of Mizuho Financial Group, attends an interview with Reuters at the bank's headquarters in Tokyo, Japan, April 19, 2017. Picture taken April 19, 2017. REUTERS/Toru Hanai 

Koji Fujiwara, President and CEO of Mizuho Bank, core banking unit of Mizuho Financial Group, attends an interview with Reuters at the bank's headquarters in Tokyo, Japan, April 19, 2017. Picture taken April 19, 2017. REUTERS/Toru Hanai 

Koji Fujiwara, President and CEO of Mizuho Bank, core banking unit of Mizuho Financial Group, attends an interview with Reuters at the bank's headquarters in Tokyo, Japan, April 19, 2017. Picture taken April 19, 2017. REUTERS/Toru Hanai 

Koji Fujiwara, President and CEO of Mizuho Bank, core banking unit of Mizuho Financial Group, attends an interview with Reuters at the bank's headquarters in Tokyo, Japan, April 19, 2017. Picture taken April 19, 2017. REUTERS/Toru Hanai 

Koji Fujiwara, President and CEO of Mizuho Bank, core banking unit of Mizuho Financial Group, poses for a photo after an interview with Reuters at the bank's headquarters in Tokyo, Japan, April 19, 2017. Picture taken April 19, 2017. REUTERS/Toru Hanai 

Demonstrators protest against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

Demonstrators protest against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

A demonstrator protests against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

Demonstrators protest against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

Demonstrators protest against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

Demonstrators protest against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

Demonstrators protest against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

A demonstrator protests against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

Demonstrators protest against the Dakota Access Pipeline, outside the Mizuho Bank in New York, U.S., February 1, 2017. REUTERS/Lucas Jackson 

Mizuho Bank's signboard is pictured in Tokyo, Japan, January 25, 2017. Picture taken January 25, 2017. REUTERS/Kim Kyung-Hoon 

Pedestrians are reflected on Mizuho Bank's signboard in Tokyo, Japan, January 25, 2017. Picture taken January 25, 2017. REUTERS/Kim Kyung-Hoon 

Mizuho Financial Group's logo is seen next to an electronic board showing stock prices indexes at a branch of Mizuho Securities in Tokyo, Japan January 25, 2017. Picture taken January 25, 2017. REUTERS/Kim Kyung-Hoon 

Mizuho Bank's signboard is seen in front of Mitsubishi UFJ Financial Group's Bank of Tokyo-Mitsubishi UFJ in Tokyo, Japan January 25, 2017. Picture taken January 25, 2017. REUTERS/Kim Kyung-Hoon 

A man walks past a branch of the Mizuho bank in Tokyo, Japan, May 13, 2016. REUTERS/Thomas Peter 

A man leaves a branch of the Mizuho bank in Tokyo, Japan, May 13, 2016. REUTERS/Thomas Peter 

Vietcombank staff walk past a branch in Hanoi, Vietnam March 21, 2016. REUTERS/Kham 

Vietcombank staff walk past a branch in Hanoi, Vietnam March 21, 2016. REUTERS/Kham 

A woman walks past a branch of Vietcombank in Hanoi, Vietnam March 21, 2016. REUTERS/Kham 

Yasuhiro Sato, president and group chief executive officer of Mizuho Financial Group Inc, speaks during a news conference at the Bank of Japan headquarters in Tokyo, Japan, November 13, 2015. Mizuho Financial Group Inc said on Friday net profit rose 8.1 percent for the six months ended in September, helped by gains from selling corporate clients' stocks held for business relations purposes. REUTERS/Yuya Shino 

Yasuhiro Sato, president and group chief executive officer of Mizuho Financial Group Inc, speaks during a news conference at the Bank of Japan headquarters in Tokyo, Japan, November 13, 2015. Mizuho Financial Group Inc said on Friday net profit rose 8.1 percent for the six months ended in September, helped by gains from selling corporate clients' stocks held for business relations purposes. REUTERS/Yuya Shino 

Yasuhiro Sato (C), president and group chief executive officer of Mizuho Financial Group Inc, attends a news conference at the Bank of Japan headquarters in Tokyo, Japan, November 13, 2015. Mizuho Financial Group Inc said on Friday net profit rose 8.1 percent for the six months ended in September, helped by gains from selling corporate clients' stocks held for business relations purposes. REUTERS/Yuya Shino 

A woman cycles past signboards of Bank of Tokyo-Mitsubishi UFJ (L), Mizuho Bank (C), and Sumitomo Mitsui Banking Corporation in Tokyo, Japan, November 12, 2015. REUTERS/Yuya Shino 

A pedestrian walks past signboards of Bank of Tokyo-Mitsubishi UFJ (L), Mizuho Bank (C), and Sumitomo Mitsui Banking Corporation in Tokyo, Japan, November 12, 2015. REUTERS/Yuya Shino 

A pedestrian walks past signboards of Resona Bank (L), Bank of Tokyo-Mitsubishi UFJ (2nd L), Mizuho Bank (3rd L), and Sumitomo Mitsui Banking Corporation in Tokyo, Japan, November 12, 2015. REUTERS/Yuya Shino 

A man walks past a signboard of Mizuho Bank ATM outside its headquarters in Tokyo, Japan, November 12, 2015. REUTERS/Yuya Shino 

People walks under a signboard of Mizuho Bank at its headquarters in Tokyo, Japan, November 12, 2015. REUTERS/Yuya Shino 

A pedestrian using his mobile phone walks past a signboard of Mizuho Bank outside its branch in Tokyo, Japan, November 12, 2015. REUTERS/Yuya Shino 

A man using Mizuho Bank ATM at its headquarters in Tokyo, Japan, November 12, 2015. REUTERS/Yuya Shino 

Tourists rest in the shade outside a Mizuho bank branch advertising its partnership with the Tokyo 2020 Olympic Games in the Ginza shopping districts in Tokyo, August 3, 2015. REUTERS/Thomas Peter 

A woman takes pictures as the sun breaks through skyscrapers housing Japan's major banks Mitsubishi UFJ Financial Group Inc (MUFG) and Mizuho Financial Group Inc in Tokyo July 31, 2015. Japan's top banks posted on Friday higher first-quarter profits that exceeded expectations as strong domestic equity markets boosted their brokerage businesses and drove gains from stock holdings. REUTERS/Thomas Peter 

Men enter the headquarters of Japanese bank Mizuho Financial Group Inc in Tokyo July 31, 2015. Japan's top banks posted on Friday higher first-quarter profits that exceeded expectations as strong domestic equity markets boosted their brokerage businesses and drove gains from stock holdings. REUTERS/Thomas Peter