Manga by author Umezu Youko

A student at the magic school, Alto, who was on the verge of repeating the school year, accidentally found a book that activated a magic circle, and as a result, summoned the sealed devil Vermeil! Vermeil is a very unhealthy older sister with a power devastating enough to be called a disaster!The apprentice magician walks side by side with the strongest being in existence!!

A student at a school of magic which was on the verge of retirement, Alto, summoned a sealed demon: Vermeil, as a result of activating the magic team of the book found by accident. Vermeil is a very seductive older sister with a mighty power that can be said to be a calamity!? The magician walks with the strongest magical monster in existence! The fantasy opening begins!