Several weeks after Arcs Reytheft is disqualified from inheriting the title of viscount, he has a peculiar dream where he had the vicariously experience of the life of another man. The man was living in a world completely different from the one he was living now. He was born in a normal household and had passed due to an accident. Waking up, Arcs decides to make use of those memories to hone his world's magic, all to triumph over his parents who viewed him as useless and regarded him with disdain

Though he was born as the eldest son of a noble family, he was disinherited due to his lack of magic aptitude. This is the story of his rise in a fantasy world as he makes use of the knowledge of the man who's life he vicariously experienced.