In his childhood, he moved with his father to Feigugen Island, far from the metropolis, where Hiroshi Fujita (Ken Sato) met his lifelong lover and Junmei (played by Ayase Yao). They grew up and became husband and wife. Chunmei made her debut as a cartoonist, but as a woman, she is famous for her works on various themes. But one day just a year ago, Chunmei chose to commit suicide. Although she was lucky to save her life, she fell into a deep coma. In order to explore the cause of his wife's suicide, Haoshi uses advanced "Sensing" technology to connect with Chunmei's consciousness. In the other person's mind, he saw his long-lost wife, while Chunmei asked him to find a picture of a plesiosaur in his childhood. After that, the line between illusion and reality is gradually blurred, and Haoshi will find unexpected facts. This film is based on Qian Lulang's science fiction mystery novel of the same name.