In the modern world, a lonely man dies in a terrible accident...and is then reborn in another world! Saved by a brilliant sage named Merlin, the baby is raised as “Shin Walford,” and undergoes training in both magic and martial arts in order to kill the monsters that rampage the land. All the while, it seems he still recalls his past life. At 15 years old, Shin has some shocking powers. But his grandfather Merlin have forgotten to teach him common sense