In 1540, Shigetoki MOTOYAMA took a chance to attack the Kira-jo Castle while Nobunao was away from the castle hunting at the Niyodo-gawa River, made the Kira-jo Castle surrender, and killed Nobunao at the Niyodo-gawa River.
天文(日本)9年（1540年）本山茂辰は宣直が仁淀川に狩猟に出かけた隙を狙い、吉良城を落城させ、仁淀川にて宣直を討ち取る。