Seiya Kanie -- handsome, scholastically successful and athletic, self-confessed narcissist Seiya Kanie is befuddled. His classmate, Isuzu Sento, gives him a musket and asks him out on a date.

With the 30-yen offer, the number of visitors slowly improves, but money is still an issue. In an attempt to find quick cash, Seiya visits Moffle, and they set off to search for a supposed treasure hidden in a cave.

The summer is here, and "Splash Ocean", the water park area, is brimming with guests as usual today. Isuzu, Muse, and the other four fairies are busy in pirate costumes. Meanwhile, Joe the shark notices something wrong in the machine room.

Muse and others practice for a new show, but they're completely out of sync and uncoordinated. Latifah is worried, and decides to host a sukiyaki party in order to deepen their friendship.

Seiya is more determined than ever, after finding out Latifah's secret. He comes up with an idea that will help them achieve the target visitor count before the predetermined deadline. Tricen, the head of sales, starts gathering information under Seiya's order, but...