The Prophetic Dream of the Royal Treasure

https://www.cmoa.jp/title/372462
Prince Alistear receives a mysterious prophetic dream after sleeping beside a sacred treasure of the royal family. In the dream, he sees a devastating future: his beloved fiancée Meredith dies, while Alistear himself eventually reaches the end of his life completely alone. Even worse, he realizes that this tragic future was partly caused by his own indifference. He had failed to pay attention to the people around him and was deceived by the seemingly innocent behavior of Meredith's younger sister. After awakening, Alistear decides that he will change the future before it happens. Using the knowledge from his prophetic dream, he changes his behavior, watches the people around him carefully, and takes steps to protect Meredith from the schemes that will eventually lead to her death. What begins as a terrible nightmare becomes the key to saving his beloved and rewriting their fate.