The Rejuvenated Sage

A man who had elucidated countless magical structures and, while serving as the king's close advisor for many years and steering the nation, continued to reign at the top of the magical world, one day withdrew from the times and began a life of retirement. Spending his days in peaceful simplicity—farming in fair weather and reading in foul weather—while stationed in the remote borders of the nation conducting certain research, he devised "resurrection magic," a forbidden spell that no one had ever been able to use. The man, who achieved "rejuvenation" by continually resurrecting the cells of his body, decided to "live a smooth and successful life while knowing everything about the nation," and embarks on a "school life" that he had been unable to experience in his youth. ※I'm writing this on a whim, so the settings are fairly loose. I'll revise if you point out any issues. ※※Details are noted in the activity report. Please take a look.