After retruning to secular life, Yoshiaki became the 15th Shogun in cooperation with Yoshikage ASAKURA in Echizen Province (present-day Fukui Prefecture) and Nobunaga ODA in Owari Province (present-day Aichi Prefecture), then Koremasa was awarded Akutagawa-yama-jo Castle in Settsu Province and later Takatsuki-jo Castle, he became one of three military governors of Settsu Province with Katsumasa IKEDA and Chikaoki ITAMI (However it seems he was not appointed shugo [military governor] by Nobunaga).
越前国（福井県）の朝倉義景、尾張国（愛知県）の織田信長の援助を得て還俗した義昭が15代将軍に就任すると、信長によって摂津国芥川山城、のちに高槻城を与えられ、池田勝正、伊丹親興とともに「摂津三守護」と称された（信長によって守護に任じられたわけではないようである）。