Ningen dakedo Maougun Shitennou ni Sodaterareta Ore wa, Maou no Musume ni Aisare Shihai Zokusei no Kennou o Ataeraremashita. - The Guardian of Princess

Leon was left in the demon realm after birth because of his lack of magical talents. However, the Four Heavenly Kings of the Demon King's Army captured him and became his mentors, guiding and training him. Eventually, Leon became a powerful warrior with the ability to control all types of magic. His current task is to protect Alicia, who wants to enroll in a magic school located on the peaceful "Paradise Island."