Around the time of Sanetomo MINAMOTO, Third Shogun of the Kamakura period, deceived with a tactic of a gyakushin (rebellious subject), Nyudo FUJISAWA and his son, Shiro, friction between Yoshitoki HOJO and Tsunemori WADA who are both the Shogun's senior vassals is increasing.
鎌倉三代将軍源実朝のころ、逆臣の藤沢入道・四郎父子の策略で、有力御家人の北条義時と和田常盛との軋轢が強まっている。