金装のヴェルメイユ～崖っぷち魔術師は最強の厄災と魔法世界を突き進む～

Alto, an aspiring magician, is about to repeat a grade when he accidentally summons the demon Vermeil, which was sealed in a book Alto found by chance. Not only does Vermeil hold an ancient power capable of bringing about the end of the world, she’s also quite naughty! A traditional fantasy story about a struggling magician and his powerful familiar begins with their fateful meeting! (Source: Manga UP!)