The film is adapted from a novel published in 2004 by Nadu Miyagiya. Even if the memory fades, the two worlds will gradually overlap. The young bio-archaeological research assistant was attracted by the calendar of running a small silk fish roast shop on her own. Over the years, the two gradually got to know each other better. However, one rainy morning, an accident suddenly hit. After the two met, there was a car accident. After waking up in the hospital, she lost part of her short-term memory, and that part of her memory was the time when she met Xingzhu. Xingzhu tried to live by the calendar as in the past to help her remember, but in the process, he hesitated.