When an internal conflict of the Muromachi shogunate (the Kanno Disturbance) occurred in 1350, Masanori, taking advantage of such an internal conflict, made efforts to regain and strengthen the power of the Southern Court and also conducted activities toward the unification of the Southern and Northern Courts.
正平5年/観応元年（1350年）に勃発した室町幕府の内紛（観応の擾乱）に際しては、これを機として南朝の勢力挽回に努めるとともに、南北両朝合一に向けての活動を行う。