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

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Ningen dakedo Maougun Shitennou ni Sodaterareta Ore wa, Maou no Musume ni Aisare Shihai Zokusei no Kennou o Ataeraremashita. - The Guardian of Princess is a Manga/Manhwa/Manhua in (English/Raw) language, Adventure series, english chapters have been translated and you can read them here. You are reading Ningen dakedo Maougun Shitennou ni Sodaterareta Ore wa, Maou no Musume ni Aisare Shihai Zokusei no Kennou o Ataeraremashita. - The Guardian of Princess chapters on https://manhwabtt.cc, fastest updating comic site. The Summary is

The main character, Leon, was abandoned to the world of demons right after he was born because of his lack of magical power. However, his fate changes completely when the Four Heavenly Kings of the Demon King’s Army pick him up. The Four Heavenly Kings were the strongest and most powerful figures in the world had trained him personally and took good care of him. As time passed, the boy became a magnificent soldier of the Demon King’s army with the power to “rule” every kind of magic. Leon has been given a new mission to protect Alicia, who will enroll in a magic academy on the island called “Paradise Island.”