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
Mizuki Himeji , cuyo intelecto podría hacer de ella la estudiante de segundo más inteligente en la escuela, aparece en la clase F. Akihisa Yoshii preocupaciones por su frágil estado de salud y planes con Yuji Sakamoto para derrotar a la clase A, pero con el fin de hacer eso, tienen para luchar contra las clases bajas, y comenzar con la Clase E.
就讀文月學園2年級的吉井明久，因為考試成績而被分發到F班，但教室內的糧]卻讓他萬分錯愕。在破爛不堪的榻榻米上放著一張小茶几…從施工不善的窗戶縫隙更是不停吹進冷颼颼的寒風。明久為了同班的美少女姬路瑞希，以及為了簡瘜o種糟到不行的環境，因此決定與F班班長（同時也是損友）的阪本雄二，對等級較高的E班發動「測驗召喚戰爭」…！？
In una scuola in cui le classi degli studenti vengono decise attraverso un test, Akihisa Yoshii scopre che è stato assegnato nella classe peggiore: la classe F. Insieme a lui ci sono Minami, Hideyoshi, Yuuji, Kouta e Himeji Mizuki, una ragazza che si è sentita male durante l'esame, ottenendo un punteggio pari a zero.
