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!
在现代日本工作的青年,由于交通事故而以婴儿之身转生到异世界!!他被号称贤者的男子捡到,一边学习魔法一边以“贤者之孙”的身份成长着。这位贤者之孙的名字是……“西恩”!西恩凭借前世的记忆以及贤者教他的魔法,获得了惊人的“超规格”的强大。过了15年,贤者正为他的成长而感到高兴,却突然说出了冲击性的话语——。“啊,忘记教他常识了!”空有一身魔法,却对这个世界一无所知的西恩,为了获得常识与朋友,而进入了高等魔法学院——!魔法、剑术、知识全都是超出常规的强大,却让周围人傻眼的异色主人公所带来的异世界奇幻生活就此开幕!!