In Edo he negotiated with the cabinet officials of Shogunate in cooperation with the Imperial envoy and succeeded in realizing Yoshinobu's assumption of Shogun assistant role on August 14 and Shungaku's assumption of political affairs president on August 17 (Bunkyu Reform).
当地において勅使とともに幕閣との交渉に当たり、7月6日に慶喜の将軍後見職、9日に春嶽の政事総裁職の就任を実現させる（文久の改革）。