He was promoted to the top position at the Tosa clan's trading office in Nagasaki, responsible for trading camphor oil and paper to buy ships, weapons, and ammunition.
Ia kemudian dipromosikan ke posisi teratas di marga Tosa kantor perdagangan di Nagasaki, yang bertanggung jawab untuk perdagangan minyak kamper dan kertas untuk membeli kapal, senjata, dan amunisi.