Molester Man is a perverted, socially inept otaku who spends most of his time on the textboard 2ch. One day, on the way home from his part-time job, he is mistaken for a stalker and arrested. After clearing the misunderstanding, Molester Man learns that the girl, whom he subsequently refers to as Miss Understanding, was left traumatized by her stalker, so he offers his hand in the hope of dating her. However, exceeding his own expectations, he gradually becomes closer to Miss Understanding and her friends, the cheerful Kansai and the guileless Loli Jugs. Chikan Otoko is based on a real-life story of a 20-year-old university student, which was posted on 2ch on November 5, 2004.