In the kingdom of Earlshide, Merlin Wolford was once considered a national hero, celebrated for his power and accomplishments. However, preferring a quiet existence, he isolates himself deep in the rural woods, devoting his time to raising an orphan he rescued. This orphan is Shin, a typical salaryman from modern-day Japan who was reincarnated into Merlin's world while retaining his memories of his past life. As the years go by, Shin demonstrates exceptional talent in both magic and martial arts, much to Merlin's ongoing astonishment. On his 15th birthday, it becomes clear that Shin has only developed his combat abilities, neglecting everything else. This leaves him with obvious social awkwardness, a lack of common sense, and a mediocre sense of responsibility. Consequently, Shin enrolls in the kingdom's Magic Academy to refine his skills and mature alongside other teenagers. Yet, living a normal life proves impossible, as he is quickly established as a local celebrity almost immediately upon his arrival. As Shin Wolford adapts to his high school life in the capital, he makes new friends, learns about the world, and battles the various evil forces threatening him and his city.