Ito left to study in Mito City where he studied swordsmanship (swordplay in Shindo-Munen ryu style) under Kenshiro KANEKO, a retainer of the Mito Domain, learned Mitogaku (the scholarship and academic traditions that arose in the Mito Domain) and devoted himself to imperialism.
伊東は水戸市へ遊学し、水戸藩士・金子健四郎に剣（神道無念流剣術）を学び、また、水戸学を学んで勤王思想に傾倒する。