Set in the early years of the Republic of China in Tianjin, a series of mysterious deaths among dozens of sewer workers leaves the people in a state of panic.

Shenxiu has felt a deep sadness since her mother left. A storm plunges her into a dreamlike world of swirling colour. Led by the Hyjinx, and joined by inventive underwater chef Nanhe, she embarks on a quest to find solace in the Eye of the Deep Sea.