In Devil's Kettle, Minnesota, Needy Kesnicki is a shy teenage student that idolizes her cheerleader friend Jennifer Check, who is very arrogant. They attend a performance of the rock band Low Shoulder at a bar, and the band leader overhears that Jennifer is a virgin. When the place is set on fire, Jennifer is abducted by the band in their van. She later appears at Needy's home, covered in blood, throwing up a dark liquid and with a weird behavior. Over the next few days, many male classmates are found murdered with eaten parts of their bodies. Needy and her little brother (you) discovers that Jennifer was sacrificed by the band members in a black magic ritual, but something went wrong because Jennifer was not a virgin and she transformed into a flesh-eating succubus. Needy tries to keep her boyfriend Chip away from Jennifer.