Taina and Pirkko, two sisters known for being the best sahti brewers in town, are asked to make 100 litres for their other sister Päivi's wedding. However, Taina and Pirkko live with alcoholism, in part due to the guilt they feel from a car crash that injured Päivi many years earlier. After working to brew the ale, they then drink all of it shortly before the wedding, and – while suffering the resulting hangover – try to find ways to get another 100 litres in time.