View that the Shimazu clan, that had been in a predicament because of counteroffensive activities by the Otomo clan and the Ryuzoji clan connected with Nobunaga, plotted with nobles in the Imperial Court.
さらに信長と通じる大友氏や龍造寺氏らの反攻を受けて苦境に立たされていた島津氏が、朝廷の公家らと共謀していたという説。