Mizuho Financial Group Inc. is planning to appoint Deputy President Seiji Imai as its new chairman to replace Yasuhiro Sato in April following a series of technical disruptions. The appointment of Imai, 59, who is 10 years younger than the current chairman, is seen as part of the major Japanese banking group's efforts to transform its corporate culture and restore public confidence by elevating younger executives. The move is set to be officially approved by the group's board on Monday.