Densha Otoko (Train Man in English) is a franchise that, as of the time of this writing, consists of a book, a film, a television drama, and five different manga adaptations, all of which are based on forum posts in 2ch.The main character is a nameless otaku living in Akihabara. One evening, as he is taking the train home, he sees a drunk salaryman accosting a woman. Overcoming his shyness, he intervenes, and in gratitude, the woman asks for his address and mails him an expensive Hermès tea set as a thank-you gift. The otaku relays this information on the forum he frequents, whereupon he is given the moniker "Train Man". He seeks the advice and support of his fellow forumgoers to tidy himself up and ask "Hermès" out.
Hollywood Nerd: Movie!Densha is a Type 2, while Tsuyoshi Yamada (Densha) in the TV drama is more of a Type 1. This is justified in the TV series, which treats the movie as being based on the events of the TV series. At one point, Yamada even looks up at a poster for the movie and remarks, "I'm not that handsome."
Quite a few real anime items show up on the Otaku's shelves.
The animated intro for the TV series and the use of the song "Twilight" are nods to the one of the fan-made animations that lead to the creation of Gainax.
The movie poster also shows up in the TV drama.
A lot towards Mobile Suit Gundam, but probably the most notable is the otakus' rendition of the "fallen comrades" moment after Operation Odessa, with one otaku in particular getting WAY too immersed in his portrayal of Amuro:
— Matilda-san... Matilda-san... MATILDA-SAN!!!
Pretty Woman. The song was also used for his clothes shopping montage.
Those Two Guys: The 2channers, consisting of Those Three Otaku, a hikikomori, a nurse, and a man and woman who are revealed to be husband and wife late in the movie.
The 2005 TV series contains examples of:
Accidental Pervert: Yamada volunteers to get a girl’s balloon that got stuck in a tree, and accidentally looking into a strange woman’s window while she’s getting dressed. She responds with swift anger.
Adaptation Expansion: ‘Densha’ and ‘Hermès’ are given names—Tsuyoshi Yamada and Saori Aoyama, respectively—friends, families, and work lives; most notably, ‘Densha’ has two fellow otaku friends named Matsunaga and Kawamoto and an abusive client he’s assigned to named Misuzu Jinkama, and ‘Hermès’ has a brother named Keisuke, two friends named Kaho and Yuuko, and a close friend named Kazuya Sakurai.
Arranged Marriage: Saori’s mother tries to set her up with different men in the beginning of the series, much to Saori’s chagrin. By the end of the series, her mother is looking for a new man for herself instead.
Parodied in ep. 11. Kazuya and Misuzu happen to almost run into each other on the street while contemplating their loneliness, when a random pervert tries to molest Misuzu; she starts beating him up, but pretends to be helpless when Kazuya comes by so he’ll come and ‘save’ her. Shortly after, Kazuya is seen broken-hearted, recovering from repeated injuries, and is in such poor shape he forms a club of men who’ve been dumped by Misuzu.
In the final scene in ep. 11, Tsuyoshi and Saori are seen riding off to their future on the train, when Tsuyoshi notices the drunkard who harassed Saori.
Brick Joke: Tsuyoshi's friend is particularly fascinated by a seiyuu’s ankles. When he dumps Yuuko, he tells her it’s because her ankles are fat, although it turns out it was a lie and he was just afraid of getting hurt in the relationship.
Butt Monkey: Tsuyoshi, during the first half or so of the series. Kazuya becomes this afterwards, though it’s often self-inflicted, in a sense.
Deliberate Values Dissonance: Tsuyoshi, seeking some dating advice, asks his father how he managed to win over his mother. His father tells him how he stalked her and aggressively chased away her fiancé, and Tsuyoshi realises he might be asking the wrong person.
Divorce Is Temporary: ‘Densha’ inspires a divorced man to reconcile with his estranged ex-wife and get back together with her.
Misuzu is very much this, to the point she has no shame at all at using this to advance up the corporate ladder. She dumps Kazuya on the spot when his father’s company goes bankrupt.
Saori’s friend Yuuko starts dating Matsunaga when she discovers he’s the heir of a very wealthy family.
Kaho: Have you no shame?
Yuuko: Of course not. It flew out the window once I turned 30.
Green-Eyed Monster: Kazuya, who starts desiring ‘Hermès’ after reading the board, and sabotages Tsuyoshi’s efforts every chance he gets when he realises she’s actually Saori.
Good Angel, Bad Angel: Appear before Kazuya when he debates whether or not to make a move on Saori. Ultimately, the Bad Angel punches the good angel in the face, marking Kazuya’s Face-Heel Turn.
Happily Divorced: Saori’s parents reconcile and finalise their divorce following an inspirational speech by Tsuyoshi.
Have We Met?: Saori introduces Tsuyoshi to Kaho, who mistreated him in profound disgust earlier. She doesn’t remember him.
Historical Hero Upgrade: In the series, after Tsuyoshi and Saori get together, the forum members bid ‘Densha’ a heartfelt good-bye as he ‘graduates’ from the single men’s board. In real life, when Densha and Hermes got together and it seemed they were about to sleep together for the first time, the board members started making rude remarks and Densha just left.
Horrible Judge of Character: Saori can’t tell Kazuya is manipulating her and Tsuyoshi every chance he gets and winds up believing Tsuyoshi was making fun of her on the board.
Tsuyoshi goes through this in No Good Deed Goes Unpunished below, and it doesn’t end there: after he painstakingly collects all of his papers from the gutter, a surge of water gushes out all over him, and Misuzu chews him out for being late. (As a matter of fact, Misuzu is fond of torturing him in general.)
Kazuya undergoes this frequently when his plans explode in his face.
Japanese Spirit: Mentioned by name and briefly paraphrased as the ‘otaku spirit’ by other board members.
Jerkass With A Heart Of Gold: Misuzu, though the ‘heart of gold’ part shows only little, and only after she finds out about the board. She’s basically just a Jerkass, it’s just a matter of where she directs it.
Laser-Guided Karma: Almost every manipulative scheme Kazuya tries to win Saori’s affections blow up in his face spectacularly (and rather hilariously).
Moe: Discussed in-universe by Tsuyoshi and his friends, mostly with regard to anime, and a particular board member expresses this sentiment repeatedly towards ‘Hermès’. When Saori comes to Akihabara and is confused by the otaku terminology, she evokes this tenfold in Tsuyoshi and his friends when she asks in confusion what it means.
Never My Fault: One of the men who complain about Misuzu says his life was ruined after his wife discovered their affair, other men say they’d wasted a lot of money on presents for her. This hardly sounds like it was actually her fault.
Not So Stoic: Saori briefly loses her composure when Tsuyoshi collapses in front of her, having waited for her for hours in the rain.
Paper-Thin Disguise: Kazuya pretends to be ‘Densha’ and tell the board members that ‘Hermès’ dumped him, using a very poor imitation of Tsuyoshi’s speech patterns. They see right through it and shame him away.
Perspective Flip: The 12th episode is partially this, giving more focus to Matsunaga and Ushijima (the forum member whose computer broke).
Pity Sex: Misuzu wants to ‘help’ Tsuyoshi this way after he gets dumped by Saori, so he’d forget about her; he refuses, adamant in his affection for Saori.
Poor Communication Kills: Keisuke gives a passing glance at the board and concludes that Tsuyoshi has been making fun of his sister online. She tells him never to see her again. It takes tremendous efforts from Tsuyoshi, the other board members, and Saori’s friends to get Saori to actually read the board and realise her mistake.
Professional Butt-Kisser: Tsuyoshi’s supervisor’s attitude towards the CEO’s son. His demeanour changes radically when he talks to him as opposed to Tsuyoshi.
Proud to Be a Geek: Some otakus regard those who are ashamed of being an otaku with little respect.
Really Gets Around: Misuzu, so much that by the end of the series, the men she dumped form a union.
Relationship Upgrade: Tsuyoshi and Saori. There’s even a song that plays often as background music about this theme.
Rube Goldberg Device: Kazuya builds one for an elaborate proposal to Saori on her birthday. He winds up activating it by mistake when he realises the party changed its venue and has to run out to catch her.
Schmuck Bait: Yamada has just finished collecting his papers from the gutter when he hears a rumbling noise from the pipe leading to it. Does he realise what’s going on and move aside? Does he realise he’s late for work and go, realising his curiosity will probably have to go unsatisfied? No! He looks straight into the pipe for a few seconds and doesn’t move aside when he realises what’s going on. Guess what happens next.
Screw the Rules, I Have Money!: Tsuyoshi’s company’s CEO’s son bosses Tsuyoshi’s supervisor around due to his position. When the supervisor defies him, he winds up demoted and later fired.
When looking for a socially acceptable hobby to bring up, Tsuyoshi tells Saori he surfs the net; she thinks he means surfing, as in with a surfboard and everything, and he goes along with it, trying to learn to surf before he has to demonstrate his skills. It goes awful.
When Kazuya tries to bring Saori to see his Rube Goldberg Device and propose dramatically, he accidentally drives past where Tsuyoshi has been waiting for Saori in the rain for hours. She thinks that’s where he was going to take her, and he grudgingly claims it is.