Upon reaching her coming-of-age ceremony, the duke's daughter Lee suddenly regains the memories of her previous life.

She was once a middle-aged man who had endured a difficult life. A goddess, taking pity on him, offered him the chance to reincarnate—but when he stubbornly refused, she reincarnated him anyway.

Now living as Lee Earlychar Karasebed Quewa, the beautiful daughter of a high-ranking ducal family, he has been blessed with an excessive number of powerful cheat abilities.

Confused by his absurdly favorable new circumstances, Lee decides to combine the experience of his former life with his overwhelming new abilities and finally pursue a happy life.

Thus begins the easygoing fantasy comedy of an overpowered duke's daughter who is still very much a middle-aged man on the inside.