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 power 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: Kadokawa, translated)

Kenja no Mago began as a web novel on Shousetsuka ni Narou on January 2, 2015. Kadokawa has released a revised and illustrated version of the series since July 30, 2015 under its Famitsu Bunko label.