The episode starts with the introduction of the school and the classification test (which is a test to determine your class). During the exam Himeji Mizuki faints from a fever and she is sent to the infirmary making her score in the exam a zero. Akihisa Yoshii discovers he is going into the worst class (Class F) and there he encounters Minami, Hideyoshi, Yuuji, and Kouta, who have all known Akihisa for years. Akihisa then makes fun of Minami's bust making a disturbance in the classroom. During the introductions, Mizuki arrives late to class F and happily discovers that Akihisa is also in class F. She then tells him that since she left the test ill she received a score zero aand thus was sent to Class F. Angered by this, Akihisa decides that he will attempt to send Mizuki to her correct classroom (Class A). To do this he consults Yuuji, telling him that they must declare a ESB war on class A, but his purpose is different. Yuuji decides to first declare war to class E, and he sends Akihisa to declare it (making the other class severely beat him up). As the battle starts, Minami, who is good at math, decides to take the front along with Hideyoshi and Voyeur. Akihisa stays with Yuuji. Meanwhile, Mizuki is taking a recovery test to earn points to bring her test score up from zero. When Minami is cornered by the representative of Class E, she too goes to take a recovery test and finds Mizuki solving questions rapidly. When Class E has defeated all of class F's students except Akihisa, Yuuji, and the girls, Yuuji then tells Akihisa to fight them, saying to show them his "true power" as the "Punishment Inspector". However, Akihisa's results prove to be useless and comical. Then Mizuki (and Minami) arrive, with Mizuki showing a score on a par with a class A score and easily takes out all of class E students. Yuuji then decides to not switch classroom facilities with the defeated Class E, saying he prefers to have Class E indebted to Class F. The episode finishes with Mizuki

The episode starts with a flashback between Yuuji and Shouko (Class A's representative) talking about the reforms and a way to remember them. After that Akihisa accidentally pastes his hand to his desk with super glue and he is unable to remove it. During that class F is called by Class A and they are amazed to see their installments and the luxury their living. They encounter Yuuko (Hideyoshi's twin sister) who tells them that is insult that class F exists everyone gets mad except Yuuji who keeps calm. He then declares war to class A but the battle must be one-on-one, Yuuko declines but then Shouko accepts the challenge if the opposing team make a wish come true to the winning team and then she looks at Mizuki making Akihisa think that Shouko wants Mizuki for sexual purposes but Yuuko insists on five-to-five battle. Yuuji accepts but in exchange class F's participants can choose three of the 5 themes. Yuuji tells then that he has an startegy to defeat Shouko because the date in which the reforms took was wrong so he takes advantage of it. The battle finally starts. Class F's participants are Akihisa, Minami, Mizuki, Kouta, and Yuuji while Class A's participants are Shouko, Yuuko, Kubo, Aiko and one more girl. Hideyoshi is also present but he's put as the quadrilateral girl. The first battle is Minami Vs Yuuko were Yuuko easily wins. Akihisa is next but he doubts of fightning Yuuji then tricks him saying he is the strongest in their group...with that lie he fight but he is defeatly in a flash making him angry at Yuuji. The next fight is Aiko vs Kouta. Kouta asks for a health theme but discovers Aiko is pretty good on health in the "practical way" making Kouta nosebleed...Akihisa curses Aiko but then she says he needs to relax and that she will help him...in the "practical way" making him and Kouta nosebleed then Minai and Mizuki take Akihisa apart from Aiko saying he doesn't need that knowledge but in the end Kouta won his battle. Kubo and Mizuki's fight is next whe

Akihisa and the girls go to the movies, only to bump into yuuji and shouko doing the same, although yuuji himself cannot escape due to her tazing him every chance he gets to escape. Next Sunday they go again to the movies, again bumping with shouko and yuuji. At the crepe shop both Minami and Mizuki try to feed Akihisa with their crepes, but Miharu, a girl who has a thing for Minami does not take it facing down.

After supplementary lessons in a Sunday morning, Minami claims to have made too much lunch (actually she woke up early and made it) when her younger sister, Hazuki, brought with to school to share with Akihisa, Mizuki also has made a boxed lunch for him to try, much to the angst of the FFF inquisition. And as they are sitting at the rooftop, Yuuji, Kouta and Hideyoshi try her cooking, only to go nearly out cold due to her food.

The principal initiates a treasure hunting event in which the grand prize is a mystery item. Each class is divided into groups of three. Akihisa is paired up with Yuuji and Hideyoshi and teams must solve all papers that have the coordinates. Akihisa then solely relies on his coded pencils... and a certain pencil...

Yuuji visits Akihisa, only to have a skirmish and finally tries to bathe in the pool, but was stopped by Nishimura. As they were told to clean the pool next Saturday, Yuuji invites Kouta, Mizuki, Minami and Hideyoshi to help along. He also invites Shouko, out of fear of what she will do to him when she learns of their event. Hilarity in the pool and baths ensues....

Shouko appears in Yuuji's bedroom to convince him to go with her to the Kisaragi Grand Park (or rather forcing him into going by threatening to burn all of his porn) in order to participate in the mock-wedding event by showing him the premium ticket. Yuuji, on the other hand, isnt so willing and curses Akihisa for giving her the ticket (see episode 5). As they go to the park, the group of friends are there to support them by working part time.....

The first we have Minami fussing over a photo in Akihisa's hand, then challenging him to a mock ESB, but the ESB field glitches, and the beings are acting weird, especially Akihisa's, and have taken adult versions of themselves. The principal sends Akihisa in, with his friends in the control room guiding him. But little did he know what was he going to face as his shoukanjuu clambers up the vent entrance...

Akihisa's sister, Akira, comes to his house to check up on him, and checking to see if there are evidences of any girl in his life besides her, much to his angst. Things go from bad to worse for him when his friends suspect him of hiding something, and Mizuki, who now was acting strange after Kouta stated that he might have a girlfriend, wants to enter his room. Then as they reach the door, a surprise awaits them which can test both Mizuki and Minami's denial...

Mizuki tries to give Akihisa her love letter, but complications arise when things go wrong when she tries.... And it gets worse when her love letter, along with the inner circle's own belongings are stored along with the mock tests in the vault. Then a seemingly suspicious student appears to help them in their time of need....

Class F begins to strike by fighting Class D, only to win and is pitted against Class B. Nemoto, the class representative resorts to sneaky underhanded tactics to try and win, by demoralizing Class F through trashing their room and affect Mizuki by tearing open her love letter. Akihisa, now enraged, attempts a stunt that could change the outcome of the war between classes B and F through his being....

Class F now is planning to defeat Class A, and does this by first slowly sapping them by letting them fight with other classes, with Class C agitated by Hideyoshi acting like his sister. Action and silliness ensues....

After the events in the previous episode, Akihisa manages to convince the principal to change Mizuki's class, but before he was about to be rejected, Shouko and Yuuko appear to ask for a rematch since the victory was cheap. Akihisa decides to fight alone.... but this time, its for Mizuki. Shouko has other plans for Yuuji if she wins.... through a marriage contract...