A slapstick school comedy depicting the activities of honor student class representative Opium-kun, set in "Devil's Elementary School" attended by children of demons. Opium-kun, who is a class representative of the Capricorn class at Devil's Hand Elementary School, is criticized by bad boys for his honor student, but he punishes them by turning them into stone with the evil eye of Medusa's direct lineage. One day, the bad boys, who are looking for Opium's weakness, think that Opium, who always wears a hat, is bald, and plot to take his hat...!?