Henkyou-gurashi no Maou, Tensei Shite Saikyou no Majutsushi ni Naru

Once known as the Lone Demon King, a mage residing on the frontier was an ageless being cherished by villagers as their guardian deity. However, a magical organization deemed his existence a threat and destroyed him. Two centuries later, he is reincarnated as the second son of an aristocratic family, inheriting the most powerful magic in the world. Resolved to live as a human in this new life, he holds no desire for revenge, driven instead by his genuine affection for humanity. While he previously served as a regional protector, he now navigates life as a local noble who lacks common social grace and struggles to relax. Embraced by his family and friends, he is recognized as a master magician within the guild, all while secretly maintaining his identity as the Immortal Mage.