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In 2048, the world's most advanced VR game, Nexus Zero, promises players a limitless fantasy adventure. But when quiet college student Ren Kaidou logs in, the system doesn't assign him a class—it recognizes him. As mysterious errors spread and a forgotten past begins to awaken, Ren is pulled into a conflict that blurs the line between game and reality. To uncover the truth behind the message "WELCOME BACK," he must face a world that remembers him... even if he remembers nothing.