Douglas Ford was once considered the world's strongest sorcerer. And he never really got weaker per se, it's just that he became unable to activate his skills because he developed a condition where each time he activated a skill it would reduce his maximum HP. Obviously, if his maximum HP ever reached zero, he would be dead. He couldn't effectively complete quests while avoiding using skills, and after many failed quests his guild license was revoked. So he wandered the countryside doing odd jobs. Eventually, through a happy accident, he finds a way to remove his curse, meaning he can start using his over-powered abilities again.
He meets a young girl, Ravi, who was abandoned and cursed and has no family or home to return to. Since he's always felt a strong moral compulsion to help those in need, he takes it upon himself to bring her along with him on his travels. They go from McFadden to Addington. And from there to Floria, and then to Milton and Balzac. In each town, they meet people and have adventures. But it's not just mindless wandering--he has some things which he needs to resolve with the hero, Alan, and there are circumstances in Ravi's past which put her in danger, so he needs to protect her and eventually remove the source of the danger altogether.
Stories about his exploits eventually make the newspapers. Ten years ago, Douglas loved the adulation he received, but now when he's fawned over it makes him feel uncomfortable and he runs away. Perhaps with age, he has learned humility. He's not very good at reading people and doesn't feel that he's a good parental figure for Ravi, but he wants to get better. And wants her to be happy.
[Reviewed at chapter 13]