Laura takes part in the election to decide Aozora Middle School's next student council president. Despite getting little to no support, Laura doesn't give up, and comes up with ideas for her final speech with the Tropical Club. However, on the day of the final speech, a Chou Zettai Yaraneeda appears...
Sakuragawa-sensei, the homeroom teacher of Class 1-5, looks more nervous than the students before Class Observation Day. To everyone's surprise, her father will also be there to observe the class. Manatsu and the others wonder if he has come to assess Sakuragawa-sensei's ability as a teacher, so Manatsu gets her class together to support their teacher.
The Tropical Club accidentally interrupts a TV crew currently filming Yuriko talking about Aozora Middle School when their banner knocks the crew and Yuriko into the fountain. With the Tropical Club's activities about to be suspended, the TV crew recommends the Student Council and the Tropical Club versus each other in a quiz show...
The Premium Tropical Melon Bread, a limited version of the snack, is being sold at the school! Manatsu manages to buy one, but when she leaves the Tropical Club room for a moment, it disappears! Minori then takes on the role of a detective, and the Tropical Club come together to hunt down the missing Melon Bread.
Manatsu Natsumi, a first-year junior high school student, was born and raised on a small island and has been attending junior high school in the city of Aozora since spring. On the day she moves to Aozora City, Manatsu has a shocking encounter with Laura, a mermaid who is looking for a legendary warrior, Precure.