Henkyou Gurashi No Maou, Tensei Shite Saikyou No Majutsushi Ni Naru

Henkyou Gurashi No Maou, Tensei Shite Saikyou No Majutsushi Ni Naru summary: At the frontier lived a mage known as "The Lone Demon King." The villagers considered him to be their guardian deity even though he was an immortal being. However, a magic organization deemed him dangerous and destroyed him. After 200 years, he reincarnated as the second son of an aristocrat, possessing the strongest magic power. "I'll act like a human this time..." Despite being fond of humans, he didn't harbor any thoughts of revenge and chose to live as a human in his new life. As a former guardian deity, he now lived as a local aristocrat with a lack of understanding for the common way of life. He didn't know how to relax. Though loved by family and friends as the second son of an aristocrat, within the magic guild, he was considered a master and secretly known as the "Immortal Mage."