While Mitsuyoshi and Mitsusada, father and son, were away from the home ground in Kiranosho in Mikawa Province, an incident happened; Takayoshi who was the fourth son of Mitsuyoshi embezzled the Tojo of Kiranosho, then became independent as the Tojokira clan.
満義・満貞父子が本拠地の吉良荘を留守にしている間に、満義の四男尊義が吉良荘の東条を押領し、東条吉良氏として自立するという事件が起きる。