Hundreds of billions of years ago, he guarded the entire world alone. He didn't understand the world, didn't talk about love, was aloof, and didn't care about anything. When the knife was inserted into his chest, he didn't have any thoughts, and he just wanted to sleep;
Hundreds of billions of years ago, he accidentally broke in, was rescued by him, signed an ancient contract, and became his most loyal servant;
From then on, he watched over the world and he watched over him.
Hundreds of billions of years later, their souls have changed, and he and he return to that world. What will happen to them with all their memories sealed? What happened? What has become of the world he used to protect?