Married journalist Rinka Mizuhara is assigned to cover a story on molestation for her weekly magazine. While interviewing station employee Toyabuchi for research, she ends up being sexually assaulted at his mercy. The public humiliation and overwhelming pleasure become deeply etched into her mind. Unable to confide in anyone, Rinka continues her investigation and boards the train once again. Telling herself it's for work, she unconsciously finds herself searching for molesters.