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Mizuki Himeji is one of the smartest students in Fumizuki Academy and would have probably ranked second of her level if not for her inability to finish her placement exam due to her fever. In Fumizuki Academy, leaving in the middle of an exam gets a student zero. As a result, Mizuki was placed in the worst class, class F. Despite the poor conditions of her class which were unfavourable to her fragile health, she claims to be happy because her love interest, Akihisa Yoshii, is in the same class.

Source from Wikipeida