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.
I was calculating the profit margin 
I'd achieve if I joined the student council.
Ich habe den Profit ausgerechnet,
den ich beim Schülerrat erzielen würde.
Calculaba el margen de ganancia que tendría 
si me unía al Consejo Estudiantil.
Calculaba el margen de ganancias que tendría 
si me unía al Consejo de Estudiantes.
J’étais en train de calculer
le taux de rentabilité du bureau des élèves.
Stavo calcolando il margine di profitto che avrei
avuto se mi fossi unito al consiglio studentesco.
Eu estava calculando a margem de lucro
 se eu entrasse para o conselho estudantil.