Isami KONDO seems to have had great trust in Shuntaro, which is illustrated in the fact that Shuntaro was given an important position from an early stage of his career in Shinsengumi and that he accompanied Isami Kondo in all important trips such as the trip to Edo in 1864 to recruit new members for Shinsengumi and the two trips to Choshu (Nagato Province: Yamaguchi Prefecture) in 1865 and 1866.
近藤勇の信頼が厚かったようで、初期より重用され、元治元年に江戸への隊士募集行きや、慶応元年（1865年）と慶応二年（1866年）の二度に渡る長州出張に例外なく随行している。