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.
Of course, we know you're 
involved in the Defense Club, too.
Natürlich wissen wir, dass du auch
im Erd-Verteidigungsclub bist.
Claro, sabemos que estás 
en el Club de Defensa.
Claro, sabemos que estás 
en el Club de Defensa.
Mais comme tu es
avec le club de défense,
Siamo al corrente che fai parte 
anche del club di difesa.
Claro, sabemos que você 
é do Clube de Defesa também.