Determined to seize the precious attribute of Okarun, the Serpos hit again! This time, they arise in high school and imprison the young man in a parallel dimension! Fortunately, he is rescued by Aira by whom awakened the power of the Acro-soyante and they are soon joined by Momo. But as the fight rages, the Serpos merge with their sbire: the demon of Dover and Nessy, the monster of the loch Ness!