After Hideyoshi's death in August 1598, he returned to Japan and joined Ieyasu's side during the conflict between the TOYOTOMI Administration's Gobugyo, (member of Five Major Magistrates), Mitsunari Ishida, and the Gotairo (Member of the Council of Five Elders), Ieyasu TOKUGAWA.
慶長3年（1598年）8月に秀吉が死去すると帰国し、豊臣政権における五奉行の石田三成らと五大老の徳川家康の争いでは家康派に属する。