A man who drank in the middle of the night woke up and found himself turned into a child. And he became the fifth son of a noble family in another world, Lian. Although this sudden situation made the man at a loss, because of his long-standing admiration for magic and the fact that he didn't need to work, the man soon began to enjoy this happy life where he could practice magic to his heart's content. He seemed to have a talent for magic. Not only did he quickly learn attribute magic, he also gradually learned how to summon elves and obtain excellent servants. He even built a house with magic such as "prop box" and "different space". No matter how difficult the magic was, he could quickly master it. In order to be independent from the noble family that was destined to decline, the man who became an adventurer was once the world's leading magician, and even became a noble with a higher status than before. With the strongest noble as the protagonist, it is a carefree magical fantasy story!