During the winter vacation, siblings Hari and Duri embark on a family trip and discover the sky goblin 'Jubi' collapsed on an airplane's wing, summoning 'Shinbi' and 'Kumbi'. The moment they save 'Jubi', an attack by unknown 'Skoot' begins, and the legendary monster 'Jormungandr', resurrected in a sarcophagus at the bottom of the sea, attempts to swallow the plane. Meanwhile, 'Kanglim', chosen as the exorcist of the sky, joins to save his friends, but 'Jormungandr', aiming to destroy the world, also fiercely attacks the kingdom of sky goblins, and the inevitable aerial adventure of Hari and his friends begins...