Junk Food consists of four intertwining stories. The first and fourth sections show the morning routine of an blind, old Japanese woman, waking up, buying bread and milk, praying at the family altar; however, it is the second segment where the true story begins.

An embittered young man who draws no physical pleasure from sex starts a club for his friends, luring young women into violent rape and torture by charming them over the Internet. Eventually the angry sister of one of the girls takes revenge.