Harry Potter: Pureblood in the Ashes

System-based story with very few Naruto elements, basically just the Sharingan. The main plot will stick as closely as possible to the films. Hermione is the heroine, and there is no harem. Sirius Black III, the last surviving descendant of a branch of the Black family. His parents were reduced to ashes while researching forbidden Dark Magic, leaving him a crumbling manor filled with banned books and an eye that could see through anything. On the night of his eleventh birthday, as he teetered on the brink of collapse, the System “Age of Ashes” activated. Newbie reward: Three-Tomoe Sharingan. Aboard the Hogwarts Express, he defeated a Muggle-born girl named Hermione Granger using wandless magic. She was frustrated and furious, and for the first time had met someone smarter than herself. From then on, those swirling red eyes became a puzzle she would spend seven years trying to solve. The System told him to change the plot, collect fragments, and stop the Dark Lord from being resurrected. But it didn’t tell him that when the Sharingan could foresee every danger, analyze every spell, and see into everyone’s heart, he would become blind to the most obvious things of all. Why that girl always saved him a seat across from her. Why she stayed by his side for three days while he was unconscious. Why she chose to stay when he decided to “use everyone to change fate.” The condition for evolving the Three-Tomoe Sharingan into the Mangekyo is witnessing a loved one on the brink of death. And the ultimate price is The night he shielded Hermione, the Mangekyo Sharingan opened fully for the first time. And at that same moment, it began to shatter for the first time.