Together with Haruhisa AMAGO, the Mitoya clan had several battles against the Mori clan, which inherited Ouchi's territory, but during the time of Yoshihisa AMAGO, Hisasuke surrendered to the Mori clan together with Tamekiyo MISAWA.
尼子晴久に従って、大内氏の所領を受け継いだ毛利氏と度々戦ったが、尼子義久の時代になると、久扶は三沢為清とともに毛利氏に降った。