After living an ordinary and exhausting life as an office worker, a man dies and awakens in a completely different world. He now lives in the body of a young woman named Erin, a beautiful girl with blue hair and golden eyes who once suffered from a serious illness. In a peaceful countryside, Erin is raised by a kind woman whom she eventually comes to regard as her own mother. From her, Erin learns many things, including education, history, and magic. After her mother passes away, Erin leaves the home filled with precious memories and travels to the capital. Using the knowledge her mother passed down to her, Erin decides to become a professor at the Royal Astra Magic Academy. At the academy, Erin meets students from noble families as well as ordinary citizens. She must deal with difficult classes, written exams, magic training, student duels, forest expeditions, and monster-hunting exercises. Erin is not merely a professor who teaches theory. She wants to become someone who can guide he