tokyo tokyo governor yuriko koike whose new conservative party challenge japan rule bloc oct. 22 election say friday need major change bank japan hyper-easy monetary policy sudden change next central bank chief interview koike tell reuters boj adopt hyper-easy monetary policy add unfortunately cure deflation think need big change direction ask desirable policy next boj governor say probably part extension current policy sudden change think would impact stock market boj governor haruhiko main architect monetary policy prime minister shinzo abe 5-year term expire early april 2018. tokyo governor koike need big change monetary policy