There was still plenty of storage left.… The morning his phone refused to install an update, Daichi thought the problem was the operating system. A notification appeared on the screen: Not enough storage available. He had seen it before. His phone contained thousands of photographs—receipts he no longer needed, screenshots of train schedules from trips taken years ago, blurry pictures of meals, duplicate images of the same sunset, and videos whose existence he had completely forgotten. He began deleting them. At first, it felt strangely painful. Even the photographs he knew were useless seemed to possess a tiny emotional weight. A photograph of an empty restaurant reminded him of a friend he no longer saw. A screenshot of a weather forecast brought back an afternoon when he had been waiting for someone. A photograph of an ordinary street contained, invisibly, the person he had been when he took it. Eventually, however, the s...