Fumizuki Academy is a distinctive high school in Japan that implements an innovative method for sorting students. Based on their test scores after their first year, they are ranked and allocated to a class, with the top performers being placed in A class and the rest relegated to lower classes. Unfortunately for Akihisa Yoshii, his efforts were not enough as he landed a spot in the least desirable rank, that is, F class. F class is severely lacking in several areas, particularly in its facilities, as the equipment and furniture there are outdated and in dire need of repair. However, Akihisa does not feel alone in F class as he is joined by his friend Yuuji Sakamoto and genius student Mizuki Himeji. Their presence has boosted morale among the group and made Akihisa strive harder. In a show of solidarity, F class decides to gang up and challenge the higher-ranked classes using the school's Examinations Summon Battle system, ensuring that each student summons a fantasy character with equal power to their respective test scores. The outcome of this intense battle will determine if F class emerges victorious or if they continue to remain at the bottom of the class ranking as expected.