Oosawa Maria is a Japanese photographer based in Shanghai, China. She and her colleague Mino scour the city for potentially newsworthy stories. When strange things happen at a local festival, Maria and Mino investigate right away. Suddenly, the two are caught up in a fight between unknown masked men and a strange, white-haired woman. Just as Maria is about to be caught in the crossfire, an old friend named Canaan appears and assists her in escaping. But a sinister plot involving a deadly virus soon emerges, and Canaan realizes she must confront her past if she hopes to stop the perpetrator and save her friends.