Oosawa Maria, a Japanese photographer based in Shanghai, works with her partner Mino to uncover compelling stories across the city. When a series of strange incidents unfolds during a local festival, the duo immediately investigates. They soon find themselves drawn into a confrontation between masked assailants and a mysterious white‑haired woman. Just as Maria is about to be caught in the crossfire, her old friend Canaan arrives and helps her escape. A sinister plot involving a deadly virus then emerges, forcing Canaan to confront her past if she is to stop the perpetrator and protect her friends.