A historical material that shows his appointment as Kai no Shugo amid the Kanno Disturbance which broke out due to the conflict between shogun Takauji and his younger brother Tadayoshi ASHIKAGA, implicates Nobutake's entrance into Kai Province to hunt down and kill Tadayoshi.
将軍尊氏と実弟足利直義の対立から発生した観応の擾乱の最中には甲斐守護への補任を示す史料が見られ、直義追討のため甲斐へ入国したと考えられている。