I recommend "Naruto: The Ominous Man" to you. The plot of this novel is very cruel to the main character. The main character has a villain's perspective, and there will be scenes where the villain tortures the main character. At the same time, this novel was also a light novel, a derivative doujinshi novel. It was set in Naruto, which was very suitable for readers who liked ninja stories. I hope you like this recommendation. Muah ~