Shackles of Dreams: Folding of Reality

He has been having lucid dreams since he was a child. Everything in the dream is very real, but when you wake up, nothing will remain. Until the day his grandmother died, he found an old book among his grandmother's belongings that he couldn't understand. After that, the dreams started to look different. Some things begin to "appear" in reality. It started out as a trivial coincidence. But soon he discovered that these changes were becoming more frequent. And it can't be explained. He tries to control it, validate it, even exploit it. Until one day, he realized something even more dangerous - these changes didn't just happen to him. Someone is "doing the same thing" in the dream. And the boundaries between them are gradually disappearing.