Jūshimatsu Matsuno, the fifth son among the Matsuno sextuplets, possesses a profoundly kind nature that also serves as his greatest vulnerability. His name draws its origin from "jūshimatsu" (十姉妹), the Japanese term for the society finch bird. In the special story "Osomatsu-kun Grows Up," depicting the brothers' adult lives, Jūshimatsu pursues a career as a doctor.