Paper Cranes on Rainy Days

During the rainy season at Yulan Middle School, Lin Xia picked up a soaked blue paper crane at the school gate. When her fingertips touched the paper, she felt a sadness that was not her own. The paper crane only wakes up in the natural rain, pointing to the lost things trapped by regret, and also leads her to the silent young man Zhou Yan. Zhou Yan waited for his missing sister for four years and folded 407 paper cranes. In order to recover lost things, missing memories and people erased from files, Lin Xia, Zhou Yan and Xu Qing set up a lost and found agency. But when an extra door opened in the corridor of the old library in the rain, Lin Xia discovered: the truth she was looking for was also looking for her. Someone is stuck in the rain, waiting for them to remember.