Mitsuha is a female college student and the daughter of a top company. She lives happily with her boyfriend Kitayama, but his true identity is a delinquent working for a corporate subordinate of a gang. Kitayama conspires with his coworkers and gang members, who are the company's superiors, to lure Mitsuha into the underground sex industry. The pure and innocent Mitsuha, who blindly loves Kitayama, listens to what he says without really knowing what she's doing and goes to a gruesome place where vulgar men gather...