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.
He was also known as  in his youth. At five years old, Tatsumi moved to Kuwana with his adoptive father, and at eight years old, he entered the Rikkyokan domain school, studying literature and martial arts, receiving a commendation for academic excellence at fifteen years old.