After the death of Nagamasa KIZAWA, he succeeded the position of the Yamashiro Gundai of his elder brother, Naganobu and took part in the war against Ujitsuna HOSOKAWA and Masakuni HATAKEYAMA, who was united with Ujitsuna, on one hand, and had an audience with the Emperor Gonara following Harumoto in 1547, on the other.
木沢長政の死後、同じ頃に死去した兄・長信の後を受けて山城郡代となり、細川氏綱やこれと結ぶ畠山政国らとの戦いに参加する一方、天文15年には晴元に従って後奈良天皇に拝謁している。