He submitted a petition to Katamori MATSUDAIRA, who was the head of the Aizu domain in the Kyoto Shugo Shoku post (the deputy of Kyoto), such that they could call themselves the 'Mibu Roshigumi' and start their own activities under the control of the Kyoto Shugo Shoku.
京都守護職会津藩主・松平容保に嘆願書を提出し、京都守護職配下で「壬生浪士組」と名乗り、活動を開始した。