It is recorded that although he participated in the battle at Nio-san Mountain and raised an army at Mitani-jo Castle, Kii Province in 1385, Masanori was defeated in the battle against Yoshimasa YAMANA of the Northern Court.
その後、元中2年/至徳2年（1385年）に二王山での合戦への参加、また同年に紀伊国三谷城で挙兵したものの北朝方の山名義理との合戦で敗れた記録が残っている。