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* AlternativeCharacterInterpretation:
** In the prequel series by the original authors, Tomoko is less sympathetic than in the original, thanks to her {{jerkass}} treatment of SitcomArchnemesis Komiyama (because she doesn't want to [[LesYay "share" Yuu]] [[GreenEyedMonster with another girl]]!)
*** This leads to the discussion about how Tomoko remains a jerkass, but being worse off in high school may make readers overlook her less savory traits. In the main series, she still has the same jerkish tendencies but she's [[JerkassWoobie depicted more pitifully]]. At present, her only friend attends a different school while she's making no new friends on her own, and she's also a massive ButtMonkey, whereas in the prequel, Tomoko is less pitiful since she regularly hangs out with her only friend and Komiyama, and isn't as much of a ButtMonkey. The main manga also mainly shows Tomoko's point of view while the prequel mainly shows what other people think of her.
** To what extent is Tomoko's situation really her fault, and to what extent is it under her control? Does she have some AmbiguousDisorder or is it more self-fulfilling?
** Could Tomoki [[AccompliceByInaction do more to help his sister]] - or does he have his hands full with her already, since she often acts like an AnnoyingYoungerSibling, apart from her issues (filching his drinks, etc.)?
** Tomoko's classmates typically don't bully or mock her, but they don't take much notice of her either. Though whenever they talk to her, they treat her normally. Even considering Tomoko's own issues, are her classmates more {{nice|Guy}} or [[AccompliceByInaction indifferent]] people?
** Did Komiyama really [[spoiler:want to reconcile with Tomoko for her sake]] or [[spoiler:did she just want to get close to her crush Tomoki? Or both? Was Tomoko ironically on the right track when she accused her of only craving his cock? On one hand, Komiyama only responded to Tomoko's own overtures of friendship when she found out Tomoki attended their school too. On the other hand, she honestly admitted to Tomoko that she didn't like her back then, and said she hoped they could get along now.]]
* AwesomeMusic: [[http://www.youtube.com/watch?v=HAIAXFQ0T74 The opening]] has gotten very positive reactions. This could be because the music is more for a battle manga then a slice of life story.
* EarWorm: The opening and some of the endings, such as the cover of "Natsu Matsuri" featuring [[{{Vocaloid}} Hatsune Miku]].
* EnsembleDarkhorse: Komiyama, to the point where she's now featured in the main series.
* FanPreferredCouple: Tomoko is usually shipped with [[BrotherSisterIncest Tomoki]] and [[LesYay Yuu]].
* GermansLoveDavidHasselhoff: The manga rapidly gained a [[CultClassic fanbase]] outside of Japan via [[{{Imageboards}} 4chan's /a/]] -- [[ThisLoserIsYou mainly out of empathy.]] It also has a fanbase on /v/ as well, despite their irrational hatred of anything that can be somehow traced back to Japan. The cover of the first volume even acknowledges the foreign fanbase.
** This has also become a ColbertBump - a significant number of people have bought copies of the tankōbon (despite not knowing the language) simply to support the authors, which in itself has drawn even more attention to the manga.
** So much so that SquareEnix ended up {{lampshad|eHanging}}ing it with an AprilFools [[http://www.world-three.org/2012/04/01/poor-little-japanese-girl/ announcement.]]
** The authors even said on Twitter that this act was responsible not only for the anime being made, but also the continuation of the manga itself.
** Early on, some fans on 4chan showed they cared by [[spoiler:tweeting the authors pictures of their penises]], which the authors [[http://mangafox.me/manga/watashi_ga_motenai_no_wa_dou_kangaete_mo_omaera_ga_warui/v02/c019.5/7.html acknowledged in an omake]].
** Heck, it's actually popular enough that it is given an English dub and BD treatment by Creator/SentaiFilmworks
* FridgeHorror: Tomoko has a thing for [[BastardBoyfriend abusive]] {{yandere}} men. Now it's just fantasies and video games, but when she's older...
*** Considering how her mother is known to slap her on some occassions (generally deserved), she is definitely not ''unfamiliar'' with the idea of a beloved family member hitting her...
** Additionally, just how far might she go in order to get laid? Venturing into the red-light district scared her, but again, when she's older...
** Alternatively, she could be an abusive yandere herself, if she's desperate enough.
* HarsherInHindsight: Tomoko's petty annoyances on Tomoki, such as hogging the shower while he's getting sick and playing a prank on him purely on a whim, becomes less funny considering that this behavior is what made him start hating her in the first place.
* HilariousInHindsight: The manga club guy comments that he draws the same type of face for background characters because it is the easiest for him to draw. Later, Nico Tanigawa would publish ''Number Girl'', a 4-Koma about... clones.
** ''VideoGame/PokemonXAndY'' reintroduces the Hex Maniac trainer class - which now bears a striking resemblance to Tomoko (and the Fairy Girl trainer class to Yuu). Much MemeticMutation ensued.
** Unfortunately, local BD sales of the anime weren't good. But Tomoko was right since the very beginning: the title Manga/NoMatterHowILookAtItItsYouGuysFaultImNotPopular is entirely true because it really is those Japanese guys' fault, as [[GermansLoveDavidHasselhoff she's more popular among foreign fans]].
* HollywoodHomely: Tomoko, though less so than most examples, especially by anime standards. For an anti-social shut-in, she actually looks the part, with dull, baggy eyes and regularly making some rather unflattering facial expressions.
* LesYay: One sided. Tomoko has it for Yuu. [[http://www.mangareader.net/its-not-my-fault-that-im-not-popular/21/7 This page]] and [[http://www.mangareader.net/its-not-my-fault-that-im-not-popular/8/9 this other one]] are blatant evidence.
** Chapter 21 is basically 20 pages of Tomoko trying to get Yuu to hug her ([[CovertPervert for a chance to touch Yuu's butt]]) any way possible and wondering whether she's being gay. The fans know the answer in their hearts. Also, a WhatIf omake set immediately after the events of this chapter has the StudentCouncilPresident Megumi hug Tomoko, only for Tomoko to take this opportunity to grope Megumi instead of Yuu.
** Chapter 29 reveals that she's been regularly sending weird texts to her friend. [[http://www.mangareader.net/its-not-my-fault-that-im-not-popular/29/2 "Yuu-chan, what kind of panties are you wearing right now?"]] indeed.[[note]]Though this particular line might be a CallBack to the events of chapter 8, and thus NotWhatItLooksLike.[[/note]]
** The ending of the first chapter of the spin-off series reveals that Tomoko's lust for Yuu dates back to the very day the two met. That same chapter also has a present-day Tomoko wondering if she can get away with groping Yuu while riding behind her on a bike. While drooling. In the second chapter she gets jealous when Yuu reveals that she befriended Kotomi while Tomoko was staying home sick.
** Chapter 7 of the spin-off. [[spoiler:Now it is a les perverts triangle.]]
** In the volume 4 omake, Tomoko channels her Yuu-lust into an otome heroine who looks like her.
** Chapter 51 is all about Tomoko mistaking simple kindness from girls as lesbianism. She also reveals that she is constantly harassing Yuu, but that's just normal.
** In the second Christmas special Tomoko convinces herself that Yuu had sex with her boyfriend... and then tries to reenact with a plushie what she thinks Yuu did with her boyfriend. While calling the plushie "Yuu" throughout the act, at that.
** In chapter 54, Tomoko apparently thinks she and Yuu are in a relationship; when Yuu and Komiyama get to talking, Tomoko interprets it as Yuu flirting with Komiyama, and gets pissed off with Yuu.
* LGBTFanbase: Tomoki [[http://fire-kitsune-love.tumblr.com/post/59680180819/the-most-wanted-anime-boyfriend-voted-by-gay-people placed 20th in a Japanese poll of which anime character gay men would most want to date]].
* MemeticMutation: [[http://1-media-cdn.foolz.us/ffuuka/board/a/image/1357/54/1357545591445.png SERVES YOU RIGHT!]]
* MisaimedFandom: Despite Tomoko's dysfunctional nature, not to mention her more unpleasant traits (which show up more as the manga progresses), some readers and viewers are proud to claim [[AudienceSurrogate they're just like her]] without an ounce of SelfDeprecation - though [[ThisLoserIsYou she's usually not very admirable to start with.]] Relatable, pitiable, even sympathetic, yes - but admirable?
* {{Moe}}: Yuu fits well in this trope. [[spoiler: Except when it comes to innocence in regard to sex.]] Also, Tomoko's younger cousin Kii-chan.
** Arguably Tomoko in [[Laconic/{{Moe}} the original sense]], though it's offset by her less savory traits.
** The {{Author Avatar}}s of Nico Tanigawa as [[RidiculouslyCuteCritter little mammals]] in omakes, the avatar of the female artist in particular. [[spoiler:When foreign fans sent them pictures of their penises, she claimed never to have seen one before. She was also bothered by the male writer perving over Tomoko's voice actress recording her lines, and by the conditions of workers in the animation studio.]]
* MorePopularSpinoff: ''It's Your Fault My Friend's Not Popular'' featuring Yuu began running in January 2013. While it's not clear yet whether it'll sell more copies than the original, it is running in ''Monthly Joker'' instead of ''Gangan Online''.
* NarmCharm: The opening is so incredibly unfitting that it circles back to being awesome and makes you want to cheer for Tomoko.
* NightmareFuel: Some of Tomoko's expressions are unsettling, to say the least.
** For example: In the first episode where she threatens Tomoki that she would kill herself if he didn't talk to her. With the aforementioned expressions and dark atmosphere, it makes it seem like she would seriously kill herself.
* {{Squick}}: Tomoko sure is bent on getting her little brother to be attracted to her. Though when he gets up close to her during such a moment (just to show her out) [[HypocriticalHumor she freaks out a bit.]]
* TearJerker: It feels like it was made just for this and it ''is'' difficult to keep perfectly dry eyes when reading the manga and/or watching the anime.
* TheyWastedAPerfectlyGoodCharacter: You'd think Tomoko's parents would have a bigger role and maybe help Tomoko deal with her problems. [[AdultsAreUseless They're heavily ignored]], which is most likely due to ValuesDissonance (since in Japan many people look down on those who seek therapy).
* UglyCute: Tomoko. It's certainly easy to see why she isn't considered attractive, but there's definitely a charm to her goofy appearance.
* UnpopularPopularCharacter: Guess who?
* ValuesDissonance: One of the bigger western gripes with the plot is the overall lack of input from Tomoko's parents, or [[AdultsAreUseless adults in general]], to get her help with her glaring antisocial tendencies. In context, this isn't that surprising: Japan's take on social therapy/counselling is nowhere near as common or acknowledged as the West's.
** Strangely enough, Tomoko's current (2nd year) homeroom teacher doesn't seem to have that memo and butts in, trying to get her to open up in very blunt ways, with Tomoko's expressions definitely looking of the "StopHelpingMe" variety.
* TheWoobie: Tomoko, pretty much. You just have to feel sorry for a girl who just has no idea how to talk to people without making herself look like a total dork.
** JerkassWoobie: She can also be {{unsympathetic|ComedyProtagonist}} at times, which shows how she's self-defeating. The fact that she apparently can't read other people's basic emotions, to the point where she interprets an innocent crush as perverse lust [[spoiler:(see her incident with Komiyama)]], makes it easy for her to be extremely cruel and rude to other people, but also a very sad individual to behold.
** As of chapter 47 [[spoiler:Komiyama is TheWoobie as well, what with her being twice humiliated in front of her crush by Tomoko.]]

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