One day, Tatsumi, a lonely underworld worker, comes across the murder scene of his ex-girlfriend Kyoko. Tatsumi escapes with Kyoko's younger sister, Aoi, who was with her. On the other hand, Aoi, who has lost her beloved family and vows revenge, pursues the murderer of Kyoko. Tatsumi, who is at loggerheads with the impudent Aoi, decides to accompany her on her journey for revenge, and as he cooperates with her, a certain feeling begins to develop.
Following the excitement of first Bangkok and then New York, a big murder case takes place in Tokyo. Chinatown master detectives Tangren and Qinfeng are invited to take up the mystery. Adding to the excitement are the other detectives on the CRIMASTER international detective list as well as the current top rank, Q. Yet another hilarious battle of wits is set to take place...