The God of Death, Riuk, had already seen the cause and date of Yue's death when he handed it to Yagami Yue's Notes, but for the God of Death, who has endless life, all of this is just a game for him to kill time. When we are human beings, we expect ourselves to become omnipotent and able to control the life and death of others. But when we truly become the God of Death, we discover that both eternal life and the ability to live, kill, and seize are all cages that imprison our souls, and we will never be free in them.
Although it is time-traveled into the anime, the plot is very different from the anime. It basically uses the anime as the background. And Jiuli doesn't have any obvious likes or dislikes for every anime character, so if you see changes in your favorite anime characters and you can't accept them, please avoid them.