Naruto: The Fox Demon’s Powerful Body, Even Kaguya Goes Wild

[Real fox demon + ruthless killer + no harems + no holier-than-thou heroine + pure power fantasy] What are the Hokage's regrets? Jiraiya's death? Uchiha Itachi's death? Neji's death...? None of those! The Hokage's real regret is that Tenten doesn't even have a boyfriend! Hinata married a blockhead! Ino married a numbskull! Kurenai Yuhi was stuck with a bearded fool, left a lonely widow, and even got fat! Tsunade and Mei Terumi grew old alone... Yang Xing transmigrates to the world of the Hokage and binds himself to the Heaven-Defying Choice System. He is determined to make up for the Hokage's real regrets. The synopsis doesn't do it justice. Handsome guys and beautiful ladies, please head to the story itself.