Origao mura ni kyodaien ga shutsugen. Keisatsu wa seinen seiei butai ni tasuke o motometaga, seiei butai wa kaibutsu mahagonome no sei de dai konran. Bōei-gun no taigākingu sensha ga shutsudō shi, mahagonome wa obiete yama e nigeta. Hiura taichō wa, arawareta kyodaien no chōsa no tame, Ayano o hitori de origao mura e haken shita. Kyodaien no sugao wa, jitsuwa yama no shōnendatta. Otona-tachi ni owa renagara mo, yama no shōnen wa kodomo-tachi to kokoro o kayowa sete itaga, totsujo mahagonome ga mura o shūgeki. Kodomo-tachi o mamoru tame, yama no shōnen wa mae ni deta.
A giant ape appeared in Ohrigao Village. The police called the Youth Elite Team for help, but the elite team was in a mess because of the monster Mahagonome. The defense army's Tiger King tank was dispatched, and Mahagonome was frightened and fled to the mountains. Captain Hiura sent Ayano to Ohrigao Village alone to investigate the giant ape that appeared. The true face of the giant ape was actually a mountain boy. While being chased by adults, the mountain boy communicated with children, but Mahagonome suddenly attacked the village. In order to protect the children, the mountain boy stepped forward.
