A young man who surely died in an accident was reborn as a baby in another world! Afterward, he was taken in by the patriotic hero "Sage" Merlin Wolford and given the name Shin. Raised as a grandson by Merlin, he absorbed Merlin's teachings, which granted him shocking power; however, when he turned 15, his grandfather Merlin remarked: "I forgot to teach him common sense"! The unconventional other-world fantasy life of an "abnormal" boy begins here!!