In those days, under the rule of the lord Yodo YAMAUCHI, the Tosa clan supported kobu-gattai (integration of the imperial court and the shogunate) and kept a good relationship with the Aizu clan, but also had power as Tosa kinnoto (loyalist clique of Tosa) which aimed to overthrow the bakufu; therefore, under those circumstances, the incident cast a shadow over the relationship between the two clans.
当時、土佐藩は藩主山内容堂のもと公武合体を支持しており、会津藩との関係も良好であったが、内部には土佐勤王党など倒幕を目論む勢力もあり、その中で起きた傷害事件はまさに両藩の関係に水を差すものであった。