Princess Ripple and her brother venture into the human world to retrieve a powerful coin stolen by the villainous Godo, who intends to use its power to seize control of their kingdom. After a chaotic encounter at a local school, Godo captures the group and attempts to break their will using a depraved magical drug to turn them into his slaves. Despite the ordeal, the protagonists manage to fight back and reclaim the coin, realizing they must now find the remaining coins to ensure their kingdom's safety.