Set in the unusual Fumizuki Academy, students are rigidly separated into classes A through F based entirely on their academic test scores. Class A enjoys luxurious facilities, while Class F languishes in a dilapidated room with broken furniture and tatty straw mats. Akihisa Yoshii, a dimwitted yet well-meaning student, lands in Class F alongside Mizuki Himeji, a brilliant girl whose severe fever during the placement exam caused her to score zero, unjustly condemning her to the bottom tier.Determined to improve Mizuki’s learning environment and fueled by his affection for her, Akihisa rallies his eccentric classmates. Class F utilizes the school's unique "Test Summoner Battles," a system where students materialize miniature avatars whose strength is dictated by their academic test scores. Led by the fierce class representative Yuuji Sakamoto, Class F declares a "Semper Fidelis" war against the higher-ranking classes to usurp their superior facilities.Throughout their campaign, Class F faces relentless humiliation and tactical setbacks due to their poor academic prowess, yet they develop unbreakable bonds. Complicating Akihisa's life are his fiercely possessive childhood friend, Minami Shimada, who harbors secret romantic feelings for him, and the cross-dressing Hideyoshi Kinoshita, whose identical twin sister causes endless comedic confusion. Despite the comedic chaos, deeper emotional currents flow as Mizuki struggles with her feelings for Akihisa and the unintentional division she causes between him and Minami.As the inter-class war escalates, Class F challenges Class E, D, and C, employing unorthodox strategies,
psychological warfare, and sheer desperation to compensate for their low point averages. Their ultimate goal remains Class A, ruled by the arrogant Shouko Kirishima, who holds a deeply obsessive, borderline terrifying love for Yuuji.The climax centers on a massive school-wide battle where Class F pushes their academic limits and mental endurance to the absolute edge. Through breathtaking upsets and heartbreaking sacrifices, Akihisa and his friends fight not just for comfortable desks and air conditioning, but for mutual respect and validation. In the end, while their social standing remains precarious, the students of Class F discover that true worth cannot be measured by a test score alone. Their shared trials forge an unbreakable camaraderie, proving that even the lowest-ranked outcasts can achieve greatness when they stand united against an
oppressive system, forever altering the social hierarchy of Fumizuki Academy and leaving a legacy of laughter, rivalry, and blossoming romance in their wake.