Maruchi and Arachi are two children found living in a mountain cave, where they have stayed since their grandfather was murdered by the villain Blue Skull 13. The couple who discover them bring them back to civilization and teach them taekwondo, and the pair prove to be excellent students. Blue Skull 13 has not given up his schemes against humanity, though, and before long Maruchi and Arachi must stand against his wicked plans in this action film.