In January 1863, he put his name on the paper with a seal of blood (of Mitate group) swearing to the expulsion of foreigners along with Shinsaku TAKASUGI, Genzui KUSAKA, Monta SHIDO (later Kaoru INOUE), Shunsuke ITO (later Hirobumi ITO) and Yajiro SHINAGAWA.
同年12月、高杉晋作、久坂玄瑞、志道聞多（のちの井上馨）、伊藤俊輔（のちの伊藤博文）、品川弥二郎らとともに攘夷の血判書（御楯組血判書）に名を連ねた。