 He was later adopted by his uncle, a fellow retainer named Tatsumi Sakujuro Takashi, whose surname he took.He was also known as in his youth.At age five, the young Tatsumi went to Kuwana with his adoptive father, and at age 8 entered the domain school, "Rikkyokan," studying literature and martial arts, and receiving a commendation for academic excellence at age 15.