Kidstuff (Sammo Hung) has been asked by police superintendent Walter Tso (Cho Tat-wah) to investigate a case of international ammunition trade between two gangs. One of the gangs is the Japanese Yakuza in possession of stolen diamonds, and the other is a group of terrorists with a stockpile of ammunition. Whilst visiting the police station, Kidtuff meets Quito (Sylvia Chang), an old friend from when they were in the orphanage. As they embrace each other in a friendly hug, some passing police officers get the wrong idea and decide to tell her husband, Albert (Karl Maka). Albert refuses to listen to Quito and attempts to fight Kidstuff. Later, when Kidstuff and Quito decide to dine together, Albert secretly hides under their table.