Kenja no Mago
A young man who had surely died in an accident, was reborn in another world as a baby! After that, he was picked up by the patriot hero "Sage" Merlin Wolford and was given the name Shin. He was raised as a grandson by Merlin and soaked up Merlin's teachings, earning him some shocking powers; however, when he became 15, his grandfather Merlin said, "I forgot to teach him common sense!"
An "abnormal" boy's unconventional other world fantasy life starts here!
(Source: Translated official synopsis)
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