Embark on a thrilling journey to a southern island where Shinnosuke, along with his family and friends, boards a luxury liner for a special preview of Action Kamen's latest film, 'South Sea Millennium Wars.' However, their peaceful outing takes a dramatic turn when a mysterious individual known as Paradise King and his mischievous gang of gibbon monkeys snatch all the adults away to a remote island. Teaming up with Gotaro Go, the actor portraying Action Kamen, Shinnosuke engages in intense martial-arts and aerial showdowns to confront Paradise King and rescue their loved ones.