Having become overwhelming strong, a mage was bored with his life and decided to reincarnate in another era about 1000 years later. But after reincarnation, the mage now known as Kurt saw a world where magic had declined, and the mages of the era are overall much weaker than those of 1000 years ago. It also seems that Kurt is being looked down upon for his "Gold Magic" as it is called "Defective Magic Power" in this era. In order to investigate the mysterious decline of magic in this era, Kurt enrolled in the Magic Academy at the Royal Capital and showed his extraordinary talent where he would become unparalleled in this second life of his too!?
This type of demon lord reincarnation only worked because of how the protagonist is. He may be a bit perverted but he doesn't blush at every single girl he comes by. He also is very focused on his goal on why he reincarnated. Since there are only six chapters out at the moment, I can't say much for the plot. But if it's this mc, then it should be just as good as the first couple chapters are in the future.