Numakura, a middle-aged salaryman, commutes to work every morning on a crowded train full of office workers and students.

One day on his way to work, Numakura witnesses a scared schoolgirl being molested on the train, After some hesitation, Numakura tries to help her, but is misunderstood as a pervert and is seized by Masayoshi Ienaga, a handsome young lawyer, Although he desperately claims his innocence, he is sentenced to prison and locked up. He is also sued in civil court by a schoolgirl named Mio, whom he tried to save and loses his job and all his savings.

Five years later, while in prison, Numakura learns that Mio, who had accused him in a TV special that Masayoshi Ienaga, who had seized him under the mistaken impression that he was a pervert, have married and are living happily together.

Numakura vows revenge as he looks at these two people who seem to be living happily ever after, in contrast to himself who lost everything due to false accusations...