Voicing his justification for the attack, he gathered his comrades at high class restaurant in the Fukugawa area of Hachiman disguised as a Tanomoshi-ko (charity) on December 2.
討ち入りの大義名分を記した口上書を作成し、12月2日、頼母子講を装って深川八幡の料亭で全ての同志達を集結させた。