He is the president of the student council. In contrast to his aloof and perverted exterior, he is actually extremely cunning. He accomplishes his goals by manipulating and blackmailing clubs, including the Supernatural Studies Club. Along with the president, the rest of the student council is aware of the existence of witches. Yamazaki manipulates Yamada to find the identities of the seven witches by indulging him with information regarding the witches. He is aware of the seventh witch's name and uses it as a final test for his presidential successor.