Merlin Walford lives in the kingdom of Earlshide. He was once regarded as a national hero for both his power and many achievements. He now prefers a quieter life and secluded himself deep within the woods, dedicating his time to raising an orphan he saved from a demon attack. The orphans name is Shin, a normal salary man in modern-day Japan who happened to be reincarnated into Merlin's world, while still retaining most of his past memories. As the years pass, Shin displays unparalleled talent in both spell casting and hand to hand combat, much to Merlin's constant amazement.