Kyousei Tekini Tensei Sase Rareta Ojisan Wa Koushaku Reijou (kiwami) Toshiteikite Iku

A lightning struck a young lady who had just celebrated her coming-of-age ceremony.
It turned out that a goddess, moved by pity for an uncle who had endured a harsh life, had offered him reincarnation, but when he flatly refused, the goddess, in a moment of anger, forcibly reincarnated him as a high-spec young lady—a duchess’s daughter, endowed with an absurdly overpowered set of cheat skills and born into the highest ranks of the nobility!
The uncle is bewildered by his over-the-top reincarnation, but with the wisdom of his age and his cheat skills, he strives every day to make this life a happy one.