Densha Otoko refers to the supposedly true story from Japan in 2004 about a man who falls in love with a woman and woos her with the help of a supportive online message board. A media phenomenon followed which saw the making of a movie, manga, and TV drama series all based on the story.
The Densha Otoko TV drama makes playful use of split screens when it shows the interactions of the main character and his band of online supporters who offer advice, criticism, and encouragement. In the above embedded clip of episode 1 (part 6 of 6), "Densha" (as the hero is affectionately called) tells the message board that the woman has thanked him for rescuing her from a drunkard by giving him a set of Hermès teacups. In the second linked clip of episode 4 (part 2 of 6), skip to 1:44 where "Densha" has traded email addresses with the woman and his fans celebrate with an animated wave formed by their split-screen subframes.