He also worked actively as a deputy and colleague of Koin KIDO, such as formulating ' Shosha jidan kajosho' (agreement on the joint enterprise project) after having a talk with Ryoma SAKAMOTO and Saisuke GODAI of the Satsuma Domain.
また、坂本龍馬や薩摩藩の五代才助と会談して「商社示談箇条書」を作成するなど、木戸孝允の貴重な代理人かつ同僚として奔走した。