Suvi, the president of SEA Chamber of Commerce, was killed in a locked room during his meeting with Watanabe, the president of the Black Dragon Gang. All the evidence indicates that Watanabe is the only suspect. Tang Ren, Qing Feng, Hiroshi Noda and Thai Detective Tony find things suspicious and starts an investigation. However disturbance keeps getting in the way. Can they find the real murderer and what is the secret behind the crime? Let's follow the steps of Detective Chinatown to solve the case in Tokyo!