The Necromancer's Book of Stories

Saito Anzhong, a man who had lost everything and anyone he ever loved. Someone who had long since awaited death, only to find that when he achieves it, it is only his body that does so. Awakening after being shot in a meeting to assign the next general of army of his home nation, he finds himself in the body of Lev Griffins, a major but also minor villain in the novel; "How to Kill Demons Without Dying." Unfortunately for him, the original protagonist of the novel absolutely hates Lev. After the original Lev attempts to get his revenge, he earns the wrath of said original protagonist, invoking a battle with him and increasing his hatred even more. Fortunate for Saito, however, he finds himself transmigrated before the Original Lev even begins his villainy. Though Saito's luck soon betrays him as he is greeted by the god who caused his transmigration, and then employs him as the protagonists "back-up." So, inevitably, as most transmigrators do, he tries his hardest to avoid the original plot and protagonist, though with some bumps along the way. It seems that Lev's face is too attractive and Saito's luck both hates and loves him enough to make his life a very easily lived hell. It starts with Saito aiding in the first plot point, gaining the attraction of a certain Duke, then reunites with an old "friend" of Lev's, encounters and negotiates with a foolish king, and so on and so forth. As he tries to navigate around the original protagonist, the demon king, and overall main plot, Saito seems to dig a hole deeper and deeper for himself.