Akihisa, Mizuki, Minami, Yuji, Hideyoshi, Kota, Shoko, Aiko, and Akira head to the beach for an overnight stay after Akihisa finally convinces his sister to let the girls go along. Later on Akihisa and Yuji see that everyone was getting hit on except for them (Shockingly Kota was getting hit on as well), they attempt to hit on girls. However, in the end their attempt was futile and they ended up getting punished by the girls.

The group then goes to the ongoing festival held, and Akihisa notices the yukata contest that is to happen. The girls take this opportunity to punish the boys fully... by letting them wear enter the contest while crossdressing.

Hideyoshi and Yūko decide to switch roles for the time being since she cannot sing, and various rumors and suspicions are spread at the end of the day. The second part rolls back on how Akihisa met Hazuki, became the Punishment Inspector, and getting the affections of both Minami and Mizuki.

In the first part, Akihisa, Yūji, Kōta and Hideyoshi play a customized version of doubt. Mizuki arrives to talk with the guys but to no avail and eats a chocolate that she received, then starts acting very strange while still smiling... to the point of scaring Akihisa. Second part has the shōkanjūs become sentient, but the chibis also reveal exactly what their summoners are thinking...

Blackmailed by an unknown assailant, Akihisa and Yūji decide to find the culprit among the girls with the help of Kōta and Hideyoshi, their only clue being that of a burn left by culprit's mother's punishment. Before the group could continue further, a group of girls arrive in their room and say THEY installed a micro videocam in the girls' changing room...

Failing in the previous encounter due to the strong defense, Akihisa, Yūji, Kōta and Hideyoshi plan another breakthrough by inspiring the males of both their own and the other classes to reach the girls bathroom. as the probing commences, the quartet comes into heavy resistance... particularly from the girls themselves...

On the last night of the training camp after failing to peep on the girls bath yet again, the boys have one last hope to do it. they enlist the boys of every other class by giving them pictures of Himeji in her bath robe, inciting them with enough lust to get them on their side. Meanwhile, Akihisa accidentally tells Minami that he loves her in a text message. The battle is hard won, but after only seeing the principal washing herself, all 2nd year boys are suspended for a period of one week. On the returning day of school, Minami kisses Akihisa to his and Himeji's shock without any warning.

In this episode Minami tells her story, and how she met Akihisa, At first she doesn't understand a lot of Japanese , but she tries her best to understand it. When Akihisa first walks up to her in class he asks her to be friends in French, mixing up French for German, but Minami jumps to conclusions and misunderstands him. At the end of the episode Minami finds out what he is saying and tell him that Minami and Akihisa can be friends.

The episode kicks off after Minami kisses Akihisa in front of Mizuki, and things get complicated in their relationship. Meanwhile, there is evidence that there may by a war between classes F, D, and B, as Miharu is jealous of Akihisa's and Minami's "relationship," and Nemoto wanting revenge on Class F for humiliating him.

After the turbulence between Akihisa and Minami, Miharu is confronted by Akihisa (In hopes to anger her for a ESB). Akihisa successfully enrages Miharu for a battle on the school roof. After Aki gains the upper hand, he is "betrayed" by his classmates and attacked. Yuji strikes a truce with Miharu. It is revealed in the epilogue, Akihisa admits his true feelings about Minami through a tape Voyeur secretly recorded. Minami overhears this tape outside the classroom and later admits to her sister "Your sister has fallen hard for someone..."

Yūji and Shōko reminisce of an elementary school (5th grade) memory. Yūji, at the time, was considered a genius, surpassing 6th graders, and was very overconfident and selfish. A trio of jealous 6th graders try to blackmail Yūji by writing "I cheated on all of my tests" on his P.E. uniform. Shōko, already in love with Yūji, tries to stop them. However, she fails and is bullied. Yūji notices them, and decides to save Shōko, by fighting the 6th graders. Later that day, Yūji comes home beaten, and Shōko explains to his mother. Yūji's mother then lets little Shōko know that she is rooting for Shōko to gain Yūji's love.

The enemies from the past return to have a little revenge. Being embarrassed by students a year lower than them some time ago, Tsunemura and Natsukawa somewhat thought of a little way to get some payback. The system in the school, already being a little broken again for the third time, gave their principal an idea to give the students a way to settle their little fight. They decided to have a little RPG like game, on where a pair of two each time enters areas where they have to defeat the enemies en route to the final destination. The episode ends with an unfinished game and Tsunemura confessing to Hideyoshi, who refuses.

As the 2nd years' forces are dwindling, Minami and Akihisa enter the battlefield. After escaping from Miharu, Minami faints from fear. As a result, Akihisa lets her rest and goes with Mizuki. As Mizuki is telling off Akihisa for calling her a princess, the room becomes pitch black and Akihisa then pairs with Yuuji, while Mizuki finds Shouko. As the "summerfags" Tsunemura and Natsukawa prepare to battle the pair of girls, Mizuki screams at the seniors for degrading Akihisa and Yuuji, causing the girls to get eliminated. After hearing Mizuki, Akihisa and Yuuji battle the summerfags. After outwitting the summerfags, Akihisa and Yuuji win. Afterwards, Akihisa apologizes to Mizuki, who forgives him, requests that he calls her by first name, and kisses his cheek, telling him that her crush from season 1 (Akihisa himself) is still strong. Afterwards, Minami comes and asks why Akihisa didn't stay with her, causing misunderstanding and confusion, and Akihisa is chased by the girls. Yuuji also runs away from Shouko, who demands marriage for not partnering up with her. Then, all the students and Iron Man run outside in a circle.