Danran is the last guardian, walking on the boundary between reality and fantasy. His mission is not to save the world, but to protect the dark memories forgotten by mankind - the disasters and truths deliberately erased by history. One night, nameless whispers came from deep in the city. Dan Ran noticed that the cracks in his memory were spreading, and unknown beings tried to revive him. With every step of the investigation, his own memory began to collapse, making it difficult to tell the truth from the truth. He must find the truth behind oblivion in the psychological maze that is gradually getting out of control, otherwise the whole world will be swallowed by nightmares. "The Guardian's Last Mission" interweaves suspense and horror to outline the frontiers of human memory. The indifferent and lonely struggle is not only the salvation of the self, but also the confrontation with the indescribable darkness. The closer the truth is, the more broken reality becomes. Only by bravely facing forgetfulness can we protect the last fire of human nature.