Read Vermeil In Gold – A Magician Pushes Through The Magical World With The Strongest Disaster manga
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!!