Yuuji's master plan slowly starts to bear fruit as one class after another engages in a mock battle with class A. Class B is forced to battle after a deal Yuuji struck with them (including their representative, Nemoto, battling in drag). Class C gets dragged in after Hideyoshi poses as his twin sister and insults them. D & E also get involved, thinking they can take Class A after they've been weakened.
After chipping away at their health and strength, Yuuji finally makes a move on Class A, tricking them into ambushes where multiple Class F members fight one A student at a time, finishing them off. Akihisa's Being also helps by removing their belts before they can attack, causing the students to get incredibly embarrassed that their underwear is exposed. However, it doesn't work on Aiko (who chose not to wear any underwear today) or Kubo (who preemptively takes off his pants to show his love for Akihisa).
Eventually, Shouko and Yuuko find themselves fighting the top four members of Class F: Akihisa, Yuuji, Mizuki and Minami. Akihisa uses his being to drop a giant bell from the school's bell tower to prevent Class A from adding reinforcements to the fight, and Yuuji reveals that they've spent enough time training and studying that their combined strength is on equal footing with the weakened leaders of Class A. However, this also causes a problem: Because Akihisa is no longer the dumbest kid in school, his iron bracelet malfunctions and his Being disappears, causing the bell to cave in the roof of the school.
The Class A and F students suddenly find themselves dangling close to falling off the roof, but everyone manages to be rescued when the two groups work together. However, just as the touching moments are happening, Yuuko's Being finishes off Yuuji's, winning the war for Class A.