Chikan Densha: Suggestive Indecent Hips (2005)
Chikan Densha: Suggestive Indecent Hips aka Monzetsu!! Densha Otoko and Chikan Densha: Otakuna Kaikan is a 2005 Japanese pink film directed by Naoyuki Tomomatsu. It won the Bronze Prize at the Pink Grand Prix ceremony and was chosen Best Film of the year by Film Treasures magazine.
More at Wikipedia.