Mikisaburo, having left the domain in order to work for Sonno Joi Movement (the movement advocating reverence for the Emperor and the expulsion of foreigners), stayed with his older brother Ito, who was the owner of a dojo (training hall) in Fukagawa, Edo.
尊王攘夷運動に奔走すべく藩を脱した三樹三郎は、江戸深川の道場主・兄伊東のもとに身を寄せる。