Cooperating with Shintaro NAKAOKA, Mitsuaki TANAKA, Ryoma SAKAMOTO and others who were Tosa roshi (masterless samurai) and sympathetic to Choshu just like Hijikata himself, he made an effort to mediate the Satsuma-Choshu Alliance.
同じ長州系の土佐浪士中岡慎太郎・田中光顕や坂本龍馬らとも連係し、薩長同盟の仲介に尽力。