Pretty nice. Grammer is good. I could read the story with little problems. The main character is interesting, and his little speeches further develop the kind of person he is. He's an actual character. He doesn't follow the original main characters but has his own goal. His actions have real effects in contrast with fanfics making no changes in the stories. In addition, the combination of the Naruto Universe and Sukuna is well done. I thought it would be terrible, as I don't favor cross-universe fanfics often, but this idea of the authors was done well. The main character is also different from the norm. He isn't full of just nor is he pure evil. He's a man who cherishes his clan and remains true to his principles. This is peak fanfiction. A character who affects the story and characters without having to be a mindless follower.