The Caerula Adamas plot a way to destroy the mysterious Battle Lovers. They also want to destroy the Defense Club, so as to cut down on club expenses. Thus, they declare that if the club members' scores on their final exams do not meet the average, the club will be dissolved. The Defense Club reluctantly gets to studying. Meanwhile, the student council also tries to scout the financially savvy Naruko to be their treasurer. When Gero offers him a salary during negotiations, Naruko casually agrees to leave the Defense Club. Soon, a monster appears, and the four remaining Battle Lovers must struggle to defeat it themselves.

Yufuin's inspiration leads the Defense Club decides to go on a training camp to the ocean on . Meanwhile, the three student council members head to a beach resort in a limousine. The beach has bright sun and white sand, but there's something a little off about it. A strange feeling starts hovering around the group's members...

As usual, Kinugawa and Yufuin are walking to Binan High School together as friends. But after a stop at the convenience store, Yufuin suddenly gets angry at Kinugawa and yells at him. A rift forms between the two, and soon a panic develops over them potentially leaving the Defense Club. Yumoto works blindly to try to get the two to make up, but Naruko and Zaou rebuke him for it. Will Yufuin and Kinugawa ever make up?!

Our Total Conquest of Earth's Lifeforms Project has reached a serious problem.

The normally cheerful Yumoto is acting strangely. His classmate, the manager of the baseball club, takes his temperature and reveals that he has a slight fever. The members of the Defense Club take him home to the Kurotama Bath, getting an eyeful of extreme brotherly love as Gora devotedly looks after his sick brother.

Binan High is preparing for their Culture Festival. Since the class that wins the popularity vote gets a cash prize, the Defense Club will participate as well. They'll be serving Kinugawa's curry and transforming into their Battle Lovers costumes to serve "Cosplay Hero Curry."

The clash between Kinugawa and Kusatsu has brought the true identities of the Battle Lovers and Caerula Adamas to light. Shocked, Vesta and Sulfur fight Perlite, and Cerulean faces Argent.

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