Benimaru, a child actor within the itinerant Yuyama Troupe, shares a bond with fellow performer Kobako after both narrowly escaped death through the intervention of swordsman Yojiro Akizuki, an act that solidified their unwavering devotion to him. The troupe navigates Japan under the guise of theatrical productions while covertly pursuing retribution against Hario, the orchestrator of their leader’s parents’ assassination during the Ansei Purges. Though Benimaru’s specific contributions remain undefined, his presence reinforces the collective’s familial unity and mutual protectiveness. His rescue by Yojiro further intertwines their fates, reflecting the swordsman’s recurring role as a guardian amid the group’s vengeance-driven journey.