After pulling the plug on the space reality TV show "Can I Destroy the Earth? 2," the Defense Club and the Conquest Club return to their peaceful high school lives. Time has passed since that fearsome battle, and it's now autumn. The five Defense Club members have stopped serving as the Battle Lovers, and are enjoying a soak in the Kurotama Bath like always, when the Conquest Club broaches a subject that will change a great deal about events to come...
They slap their backs with 
birch branches, don't they?
Ah, da schlägt man sich doch mit
einer Birkenrinde auf den Rücken, oder?
Es lo de darse en la espalda 
con ramas de abedul, ¿no?
Ahí es donde se pegan en la espalda 
con ramas de abedul, ¿no?
C’est là qu’il faut se frapper le dos
avec des rameaux de bouleau.
E si colpiscono la schiena 
con rami di betulla, vero?
Eles passam ramos  de bétula nas costas, né?