He was the feudal retainer of Tosa Province (he left later) and was active in Tosa kinnoto (loyalist clique of Tosa) led by Hanpeita TAKECHI as well as Kaientai (Japan's first modern corporation established by Ryoma SAKAMOTO) (Roshi association) by Ryoma SAKAMOTO in the end of Edo period.
土佐国藩士（後に脱藩）で、幕末は武市半平太の土佐勤王党や坂本龍馬の海援隊(浪士結社)で活躍した。