Genryuusai Shinobibe, a human transformed into a monkey by mountain ruler Doakutara’s curse, navigates life as Himiko Shinobibe’s biological father and Ojiji Shinobibe’s adopted son, forging a foster-grandparent bond with his daughter. His signature paper-based ninjutsu, deeply revered by Himiko, complements his speech’s playful rhythm, marked by suffixes like “-yay” or “-ura.” Defeating Doakutara temporarily breaks his simian curse, though the *Shin* OVA briefly traps him in a canine form. Central to Wataru’s group in the first series and *Shin* OVA, he resurfaces in the second series via flashback. Commanding the mechanized Genjinmaru, he wields paper techniques with tactical precision. His story intertwines the struggle against cyclical transformations with unwavering loyalty to Himiko and Ojiji, anchoring his actions in familial bonds amid supernatural upheaval.