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.
When the two of them are 
together, they're unbeatable!
Die zwei zusammen sind unbesiegbar!
¡Si dos trabajan unidos, son invencibles!
¡Si dos trabajan unidos, son invencibles!
Ensemble, ils sont invincibles !
Loro due insieme sono imbattibili!
Quando os dois estão juntos, 
eles são imbatíveis!