https://wiki.d-addicts.com/Kindaichi_Shonen_no_Jikenbo#Season_2

TV Movie: The Files of Young Kindaichi: Legend of the Shanghai Mermaid
Romaji: Kindaichi Shonen no Jikenbo
Japanese: 金田一少年の事件簿　雪夜叉伝説殺人事件
Director: Yukihiko Tsutsumi
Writer: Yozaburo Kanari, Fumiya Sato, Hajime Narita
Network: NTV
Episodes: 1
Release Date: December 13, 1997

Plot
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.

720p HDTVrip

English hardsubbed TV-rip exists for this dorama.
If someone wants to make softsubs, conact with me on D-Addicts and I’ll provide them for you.
https://www.d-addicts.com/forums/viewtopic.php?f=13&t=164948