The anime centers on Manatsu, who moves from her small island birthplace to a city and starts middle school. On the day she moves she meets a mermaid girl named Laura who is looking for the "legendary warriors," the Precures. Laura's hometown, the mermaid country of Grand Ocean, has been attacked by the "procrastination witch," who has stolen the country's "motivation power."

Source: ANN

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Same setting: Futari wa Precure
Same setting: Eiga Tropical-Rouge! Precure: Petit Tobikome! Collabo Dance Party!
Side story: Eiga Tropical-Rouge! Precure: Yuki no Princess to Kiseki no Yubiwa!
Other: Eiga Precure All Stars F