He became Gaimu shojo (a post at the Ministry of Foreign Affairs, the fifth rank) in December of the same year and Gaimu gon no taijo (a post at the Ministry of Foreign Affairs, the fifth rank) in December of 1875, and served as an accompanying personnel of Kiyotaka KURODA who worked on negotiations on the Japanese-Korea Treaty of Amity.
同年12月に外務少丞、明治8年（1875）12月に外務権大丞となり、日朝修好条規締結交渉を行う黒田清隆全権の随員となった。