At Fumizuki Academy, students are assigned to classes based on their first-year exam results, with top scorers in A class and the lowest in F class, an area notorious for its dilapidated facilities and lack of supplies. Akihisa Yoshii, who is actually quite capable academically, ends up in F class alongside his friend Yuuji Sakamoto and the unexpectedly low-scoring genius Mizuki Himeji. Unwilling to accept their low status, the F class students, spearheaded by Yuuji, challenge the higher-ranked classes using the school's unique Examination Summon Battle system. This system allows students to summon creatures whose strength depends directly on their test scores. Can F class defy expectations and climb to the top, or will they remain at the bottom as everyone predicts?