Michitoshi, born as the eldest son of baishin (indirect vassal) serving for Tosa Domain, Hidetoshi IWAMURA, was given academic education under Nanrei SAKAI while he learned art of swordplay under Izo OKADA.
土佐藩陪臣岩村英俊を父に長男として生まれた通俊は、酒井南嶺の下で学問を学び岡田以蔵の下で剣術を学んだ。