The final special exam of the semester is on the horizon: a cooperative written test where students answer problems in turn. Horikita's class is up against Sakayanagi's, and everyone rushes to prepare. As this goes on, Nagumo poses a question of his own—who will be the next student council president? The candidates are Horikita and Ichinose...or are they? Does Ichinose have other plans? December may be the end of the year, but the school's new state of chaos is only beginning.