In the early years of the Republic of China, the remote town of Gulou in the north has been plagued by a mysterious disease called "skeleton disease" since 20 years ago. Patients have strange words and deeds, hallucinations, anorexia and water addiction. All patients are skinny and depressed, so Gulou Town is nicknamed "Bone Town" by the surrounding people. In recent years, there has been an external threat around Bone Town. Five years ago, a mysterious beast called "Black Blind" appeared in the nearby hazelnut forest. It often ran into the town to harass the people, making Bone Town even worse. In Bone Town, the girl Sangeng followed her master Sun Laohai to learn hunting skills since she was a child, and practiced a perfect archery skill. Unexpectedly, the Black Blind suddenly appeared five years ago, and Sun Laohai was killed while hunting the Black Blind. As a result, the girl Sangeng secretly vowed to take hunting the Black Blind as her lifelong responsibility, so she often wandered in the nearby hazelnut forest looking for the Black Blind's traces. One night, the traveling doctor Bai Xiaobai passed by the hazelnut forest outside of Bone Town and was suddenly attacked by a black blind man. Thanks to Sangeng's timely appearance to save Bai Xiaobai's life, Sangeng was surprised to find that the black blind man was afraid of the medicine in Bai Xiaobai's medicine box for some reason, but after asking Bai Xiaobai, Bai Xiaobai himself didn't know the reason. In order to find out the truth, Sangeng arrogantly took Bai Xiaobai back to Bone Town to try to solve the mystery. Bai Xiaobai, who came to the town, found that many townspeople suffered from the strange skull disease. Through the doctor's keen sense of smell, he found that everything was not as simple as it seemed on the surface, but the crisis for him also quietly came...