Nishizawa Shangzhi (Takeru Sato), who works in a car repair shop, looks like a dull young man. He and other boys attended a social gathering, and by chance, he became acquainted with the girl Nakahara Mai (Tao Tsuchiya) at the social gathering. Mai is quick-witted, cheerful and sunny, and forms a perfect complement to Shangzhi. In the following period of time, the two got closer and closer, and Shangzhi finally plucked up the courage to propose to Mai, and everything seemed beautiful. But without any signs, Mai had all kinds of strange symptoms. It was diagnosed that she suffered from a very difficult and complicated disease-anti-NMDA receptor encephalitis. In the end, Mai fell into a long coma and suffered. The girl's experience made her parents heartbroken, but Shangzhi never gave up, always sticking to his girlfriend, waiting for the day he woke up. Finally, Mai opened her eyes that had been closed for many years, but more tests are still waiting ahead... This film is adapted from real events.