In February 1581, Takaie secretly communicated with Korenori KAMEI, the lord of Shikano-jo Castle owned by the Oda clan, and conspired against the Mori clan, but his plan was detected before being carried out and Morishige SUGIHARA suppressed it at the beginning of March 1581.
同9年（1581年）1月、織田氏の鹿野城主・亀井茲矩と内通した高家は謀叛を企てるが発覚してしまい、同年2月初旬には杉原盛重によって鎮圧された。