Class F works on a Chinese maid café for the school's cultural festival. At first, the plan works out okay, but soon the Tonkonatsu duo come along and accidentally eat one of the sample sesame balls, which were made by Himeji's terrible cooking skills. Accusing them of trying to kill them, Yūji uses "Persuasive Negotiations" in the forms of "Persuasive Negations using Fists", "Persuasive Negations using Kicks" and "Persuasive Negations using Wrestling", which drives away the duo. After their departure, business starts to fail. Minami's little sister arrives, promising to help. She tells them that while she was looking Akihisa, people tell her bad rumors about the Chinese cafe. Yūji deducts that the failure of their business is because the Tonkonatsu duo is spreading ill rumors about them. This is confirmed with a visit to class A's Maid Cafe, while watching the Tonkonatsu duo shouting out the rumors. Akihisa and Yūji hatch a plan to ruin the duo's image, (which involves Akihisa wearing a maid costume) and works greatly. The duo does not appreciate this, and kidnap Hideyoshi. Akihisa misinterprets and thinks they kidnapped Himeji and Minami. The Duo states that they are going to "have their fun with them". They then use Kōta's various hidden cameras and audio cameras to find the duo in the athletic's storage. Akihisa storms toward the storage still in the maid outfit, and punches the duo. He awkwardly finds Hideyoshi playing a board game(she also explains that Minami and Himeji are at the cafe). At the end of the day, their Chinese Cafe earns enough money to buy the equipment they want (with the help of Kōta and his "deluxe photo collection") , but they can only buy the equipment under one condition: they must win a Summoning Contest. Kōta announces the favorite maid of the day, and it was Akihisa. Both Himeji, Minami and Hideyoshi ponder over this, while Akihisa freaks out over the said results.

Class F enters a summoned beast tournament in the hopes of winning better desks for their classroom. As they progress in the Summoning Tournament, they use tricks to win most of their battles, such as when they attempt to force Yūji into admitting he loves Shōko, but Yūji's resistance leads to his eventual unconsciousness and Akihasa using him as a puppet, with Hideyoshi using a voice muzzler to imitate Yūji's voice. Throughout the course of the tournament, Yūji suspects that someone is sabotaging the tournament, leading them to battle Classes B & A. In the end, The Tonkonatsu Duo are revealed to be the ones committing the said sabotage. Yūji secretly calls Pervert to cheat as well, changing the subject from the intended English to Japanese History, the only subject Akihasa studied hard for. they soon defeat them, but they run of to the PA system to reveal each other's cheating to change the win of Akihasa and Yūji into a stalemate, which defeats the purpose of them entering the tournament. Akihasa then runs after them, using a firework launcher to try and shoot them down. In the end, he accidentally bumped one of the other firework launchers, ending the night in a fiery blaze while Iron Man takes them both to their punishment. In the end, they had exhausted all their money compensating for the damage, and are saddened also since Mizuki will transfer to another school. However, when Mizuki reveals that she will not transfer, the entire gang, including Akihisa, are relieved.