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.
You should be able to do a calculation 
like that in your head immediately!
Das solltest du doch im Kopf errechnen können!
¡Deberías poder hacer esos cálculos 
en tu cabeza de inmediato!
¡Deberías poder hacer esos cálculos 
en tu cabeza de inmediato!
Tu peux tout calculer, pourtant !
Dovresti essere in grado di fare 
subito e a mente un conto del genere!
Você deveria fazer essa 
conta de cabeça imediatamente!