Kaifuku Jutsushi no Yarinaoshi

Keyaru was chosen as a Hero with extraordinary healing power, only to be abused and exploited by the very people who claimed to be his allies. After discovering that healing can restore more than wounds, he uses overwhelming magic to return the world to an earlier point in time while keeping his memories. Now he knows who will betray him and what they are capable of. Refusing to become their victim again, Keyaru begins a ruthless campaign of revenge against those who destroyed his life. A second chance gives him control of his fate, but not necessarily a path toward becoming a better person.