Kobako is a child actor in the Yuyama Troupe, a traveling kabuki theater group, performing alongside fellow child actor Benimaru as part of the ensemble. Both share a background of being rescued from a near-fatal incident by the series protagonist Yojiro Akizuki, resulting in lasting gratitude toward him. The troupe operates under motives of revenge, driven by leader Kakunojo's pursuit of justice for her parents' murder. Within this context, Kobako functions as a consistent supporting cast member without substantial character development, individual story arcs, or background changes throughout the series. Her character background and role remain confined to the main series narrative, with no appearances or development in other official media such as movies, OVAs, or spin-offs.