Convenience store clerks Chrissie (Chrissie Chau) and Katy (Carolyn Chan) decide to get back at their sleazy manager Leo (Leo Chim) by having their boyfriends (Terence Siufay and Jones Xu) pose as robbers and hold up the store, but events escalate out of control into murder. What started as an elaborate prank sets off and culminates in a butterfly effect of crime, consequence, and desperation as more and more people get pulled into the mess.