The Files of Young Kindaichi: Legend of the Shanghai Mermaid (1997)

Kindaichi is off on yet another case, this time in Shanghai. When the father of a Chinese friend of the young Kindaichi is murdered at the circus, it is up to the ever-resourceful and clever young high-school detective to solve the case. But hidden in the background is the 4000 year-old legend of the Shanghai Mermaid.