Manatsu and her friends are discussing on their next club activity when the school's disciplinary committee head, Masami Kakuta, searches the room owing to rumours of a mermaid sighting in the school. Upon learning on the search, Asuka confronts the disciplinary committee over the matter. The committee mentions a rule allowing them to confiscate suspicious items to maintain order in the school. The next day, rumours of a mermaid around and in school run rampant while Yuriko turns down Asuka's complaint and Masami almost spots Laura. Masami approaches the Tropical Club and confiscates the Aqua Pot. Later on, Elda summons a Zenzen Yaraneeda to attack a playground. Despite the other girls' worries, Laura encourages them to engage the enemy without her. The four girls transform to fight the monster but struggle against it. Meanwhile, Laura sneaks around school and reclaims her pot while evading Masami. She then returns to the Cures to salvage the Zenzen Yaraneeda's stolen motivation power, allowing the four Cures to finish it off. Afterwards, the disciplinary committee confronts the Tropical Club about the Aqua Pot, but Asuka and Minori assert its importance to the club citing another rule and revealing their teacher approved of it before the committee leaves taking a worn out Masami with them.