The Irregular at Magic High School: The Watcher

After transmigrating, Cang awakens to a world of magic with a flintstone in his left eye. Together with his cousin Shen Xue, he uncovers a universe-shaking truth: Earth is actually a prison for extraterrestrial gravekeepers, and the bloodline of Shen Xue's family is a vessel for spirit-particle viruses. The two break through seven cycles of reincarnation and discover that their world is a fairy-tale manuscript written by a higher being. In the end, they tear apart the constraints of the narrative, using a silver-haired flintstone pen to rewrite the laws of reality. They turn the bronze gate into a bookshelf, and the gravekeepers into footnotes in a fairy tale.