When Sixth Shogun Yoshinori ASHIKAGA, who had been selected for his office by lottery, but turned out to be a despotic ruler, was lured out and slain by Mitsusuke AKAMATSU (the Kakitsu Incident), the ruling power began to disintegrate.
籤引きによって選ばれた6代将軍の足利義教が専制政治をしき、1441年に赤松満祐に誘殺されると（嘉吉の乱）、政権内の情勢にほころびが見え始める。