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.
To be frank, I didn't reach average in anything.
Ich werde ehrlich sein, ich hab nirgendwo
den Durchschnitt erreicht.
La verdad, no llegué al promedio en nada.
La verdad, no llegué al promedio en nada.
En vérité…
Sinceramente, non sono sopra 
la media in nessuna materia.
Para falar a verdade, eu não fiquei
 na média em nenhuma matéria.