Synn is a hard-luck high school student. One day, he becomes student council president. But his job as president includes getting rid of mazoku (denizens of hell) that appear in his town as well. Also, he is informed that his father is the Maou (king of demons) and he is supposed to succeed to his position in the future. He has to fight against mazoku as the president, but his father is the leader of those mazoku. Well, will he be able to keep it a secret and enjoy his school life? Based on the Twinkle Crusaders visual novel/eroge.