This is a world in which the aristocracy with the power of Mana has the duty to protect mankind. Although Merida Angel was an aristocrat who studied in the school nurtured by the capable, she was a special girl who did not have Mana. In order to discover her talents, Kufa Van Pier was sent to her as a tutor. At the same time, he is also burdened with the task of "assassinating her if she doesn't have the talent". In the face of Melida, who worked tirelessly even if she didn't get anything in this society, Kufa decided to make a cruel decision, but. No, no, no. "do you want to try to entrust your life to me?" Bet on the dignity of assassinating teachers who are neither assassins nor teachers, showing the value of girls to the world!