Ryosuke (Matsuzaka Tauri), a young man who runs a West Point coffee shop, is about to marry his beloved girl Chiyo (Qingye vegetable), but in the prime of life, Qianyu suddenly disappears, and his father Yosuke suffers from pancreatic cancer, and his days are numbered. While helping to sort out the sundries, Liangsuke accidentally pulled out several old notebooks with the cover inscribed "Lily Heart (swaying Heart)." The notebook is full of pencil monologues of a woman who claims to have been afraid of the outside world since she was a child, but her helpless heart was comforted by an accident. Liangsuke was frightened by the extremely true description in the notes, but he couldn't stop. At the same time, Ms. Hosoki (Kimura Duojiang), who claims to be a friend of Qianyu, comes to the door and reveals to him the reason why Qianyu is missing. In the process of reading the notes, Liangsuke seems to be tightly grasped by the woman named Photon (Yoshiko Yoshiko), in which the great secret is hidden. This film is based on the novel of the same name by Makata Meifan.