Even after that, he kept supporting the group of Joi of Choshu Domain calling himself Yoritaro KUWABARA as a disguise; however, while visiting the gun batteries of Akamagaseki, he became sick and died there at the age of 30.
後に桑原頼太郎の変名を用いて長州攘夷派と行動をともにするが、赤間関の砲台視察中に病に倒れ、同地で30歳の生涯を閉じた。