"Tropical-Rouge! Precure" is a magical girl anime series that centers around a group of young girls who transform into warriors to protect the world from evil forces. The story begins with Manatsu Natsuumi, a cheerful and energetic middle school student who moves to a seaside town. One day, she encounters Laura, a mermaid princess from the Grand Ocean, who is searching for the Legendary Pretty Cure to save her underwater kingdom from the Witch of Delays, a villain who steals motivation and time from humans and merfolk alike. Manatsu is chosen as the leader of the Pretty Cure team, and together with Laura, they embark on a mission to gather the remaining members.

The team expands as Manatsu recruits four other girls: Sango Suzumura, a reserved and artistic student; Minori Ichinose, a bookish and intelligent girl; Asuka Takizawa, a confident and athletic karate practitioner; and Laura, who later gains the ability to transform into a Pretty Cure herself. Each member represents a different aspect of tropical life, such as the sun, coral, waves, and the ocean, and they wield unique powers to combat the Witch of Delays and her minions, the Yarane-das. The villains aim to spread lethargy and apathy, draining the world of its vitality and joy.

Throughout the series, the Pretty Cure team faces various challenges, both in their battles against the Yarane-das and in their personal lives. The narrative explores themes of friendship, perseverance, and self-discovery, as the girls learn to balance their responsibilities as magical warriors with their everyday struggles. The series also incorporates elements of environmental awareness, emphasizing the importance of protecting the ocean and its ecosystems.

As the story progresses, the team uncovers the true nature of the Witch of Delays and her connection to the Grand Ocean. The final arc sees the Pretty Cure confronting the ultimate threat to both the human and mermaid worlds, culminating in a climactic battle that tests their resolve and unity. The series concludes with the restoration of balance and the reaffirmation of the bonds between the team members, leaving a lasting impact on their lives and the world they protect.