In a school where students are harshly segregated by test scores, Akihisa Yoshii finds himself in the lowest-ranked F class known for its dismal conditions. Despite his designation as the 'baka' or idiot, Akihisa is determined to challenge the system alongside his intelligent but misplaced classmate Mizuki Himeji and his loyal friend Yuuji Sakamoto. When the opportunity arises to utilize summoned creatures in inter-class battles, Akihisa sees a chance for F class to rise against the elite A class. Led by Akihisa, F class engages in fierce confrontations, aiming to overthrow the existing hierarchy and claim their rightful place in the school.