Since the Retired Emperor Fushimi told the bakufu that he would support them, as he was frustrated with Emperor Gouda (the Cloistered Emperor Kameyama's son, and Emperor Gonijo and Imperial Prince Takaharu's father, he was ruling the cloistered government at that time) who forced his son, Emperor Gofushimi to abdicate from the throne.
伏見上皇も自分の息子である後伏見天皇を無理やり皇位から降ろさせた後宇多天皇（亀山法皇の子で後二条天皇・尊治親王の父、当時院政を行っていた）への反感から、これに同意する姿勢を幕府に伝えた。