Kouta was your average otaku, living alone in his apartment, surrounded by his figurines and anime body pillows; until Kanau came long. All of a sudden, Kouta has a daughter he never knew existed. Not only that, she is going to live with him, with no support from the mother who suddenly left her in his care. Now Kouta has to learn to be a father, all the while dealing with the rest of the crazy otaku of the Higansou.Otaku no Musume-san ("The Otaku's Daughter") is a Shounen comedy manga that centers primarily around the life of Kouta and Kanau, father and daughter.
This manga provides examples of:
Abusive Parents: The reason Taeko's mother didn't want to take care of her; she thought she would abuse Taeko.
A-Cup Angst: Haruka. Particularly in a Pool Episode scene where she realizes that some pre-teen girls have bigger breasts than her.
Alpha Bitch: Reika Misono. Her father is a politician and her mother is an actress. However, Reika isn't all that bad and her parents are fairly decent people, even if her mother is a bit snooty.
Anime Hair: Averted, as most of the characters sport normal hairstyles. Played straight with a flashback arc involving Taeko's grandfather, who sports a Heihachi haircut (he says it's James Dean).
Babies Ever After: In an omake at the end of the last chapter Haruka is seen with her young son just learning to walk. The kid's eyebrows give away who the father is immediately. Taeko also has a set of twin girls of her own with Sensei in the last chapter.
Badass: Landlady of all people was this when she turned to delinquency in her early teens. Also her grandfather and at least some of his friends would qualify as this too.
Can Not Spit It Out: Kouta, in his feelings for Taeko. At least when addressing Taeko directly.
Also with a male classmate of Kanau, who always comes close but is either too nervous or his friends come in at the wrong time.
Chekhov's Gun: In chapter 13, Kouta gets Member of Parliament Misono's business card. Forty-nine chapters later, he uses it to help convince Takurou and Nozomi to give Kanau back to him.
Chekhov's Gunman: Nicchi, during Kouta and Nozomi's first time in the art room. He can be spotted in the corner of the panel in Chapter 3, but his presence is either missable or to be assumed as inconsequential. Chapter 58 changes that when we see Nozomi's recollection of the same event, where Nicchi's presence is much more pronounced.
Taeko: Team Mom, more or less literally, as she seems to do most of the cooking for the Higansou
Haruka: The Smart Guy, Smart and snarky, though a bit bullheaded.
Formally-Named Pet: When Higansou acquires a dog, the tenants name him Soichiro-san, just like in Maison Ikkoku
Gag Nose: Nicchi's nose, although it wasn't so when he was younger. It grows longer when the worst of his lolicon tendencies begin to show. The second-to-last chapter reveals that the nose is fake.
Genki Girl: Kanau's best friend in school, on top of being an otaku, is constantly energetic.
Genre Savvy: Being an Otaku and all, Kouta (and no doubt the other otakus in the apartment) knows a thing or two about the terminology and such, like how he pointed out Haruka looked like a Tsundere with her Girlish Pigtails after her Important Haircut. Unfortunately, he's blind to the fact that her Tsundere-ness is aimed towards him.
Runs into an even worse one after the Wham Episode (you know, the whole deal with Nozomi never loving him in the first place). To the point where he's represented by a skeleton for the better part of an entire chapter. Then Haruka getsserious. It works.
Kissing Discretion Shot: Between Kouta and Haruka, perhaps to represent how her motivations to express her feelings were "tainted," in a sense by Nozomi. The omake in the last chapter and the disappearance of her leggings after the fade to black seem to say a lot more than a kiss occurred in that scene.
When Sousuke begins telling Kouta (both of them are manga artists, mind) about Taeko's history.
Kouta: A story about the landlady from 10 years ago... Sousuke: It's a bit long, but I want you to listen. Kouta: Uh, just how long is it? Sousuke: Hmm. If I only had about 32 pages a month... I'd say four to five months' worth. Kouta: I-I see. That is long... Sousuke: ...yeah. If it was my own work, I'd worry about getting tired of it.
It could also be a reference to how certain Kannagi fans reacted when they learned that one of the characters had an ex-boyfriend, implying she might not be a virgin.
Lolicon: Nicchi is an open and unrepentant lolicon. Played for laughs and Squick value. However, this turns out to be a huge plot point in chapter 58. It's him being a lolicon that lead to the subsequent events of Kanau being born. Nozomi had feelings for him back in high school (and still does), and only used Kouta and Maesawa as ways just to get Nicchi to look at her.
Locked Out of the Loop: Almost everybody at some point, but Kouta all the time. Hilariously though Niichi also seems to be in the know for everything that is going on but just can't be assed to tell anybody.
Especially the fact that Nozomi never loved Kohta at all.
Landlady: Taeko. In the final chapter, she and Sousuke have moved out, so Kouta is the new landlord.
Love Makes You Evil: What Kouta felt, after his first experience. He couldn't forgive himself for taking the purity of Kanau's mother, even though she was the one that jumped him.
Turns out that Kanau's mother jumped him just so she could get Nicchi to look at her.
Mood Whiplash: Sometimes the transitions are smooth, other times you're jerked from farce to drama.
This is especially true during the Wham Episode. Revealing that the main character's primary love interest is not only married, but has been for three years, to one of his close friends even and then trying to play it off as comedy is a big reason why some fans dislike it.
Kanau herself counts, since her mother just sent her off to the father she'd never met to concentrate on work. She's returned, and intend(ed) to take her kids back without being found. She ultimately gets away too.
Peek-a-Bangs: Haruka's original hairstyle, which imitated her older sister's.
Porn Stash: To the occasional disgust of Kanau and mortification of Kouta.
Proud to Be a Geek: As expected of the main otaku cast, but Taeko's grandfather really came as a surprise.
Replacement Love Interest: Takurou is this, of a sort, for Nozomi. His slight resemblance to Nicchi (primarily their hairstyles and the shape of their jaw) isn't made obvious until the two meet face-to-face during Kanau's birthday party.
Running Gag: Several. Nicchi's loli tendencies, and his pacification when fed sweets. Kouta's total inability to be badass, even when doing something badass. Kimiko always showing up in cosplay outfits. Also, Nozomi's jobs get increasingly ridiculous.
Villainous Breakdown: Nozomi in the second-to-last chapter when she and Kouta are arguing over Kanau's custody, to the point where she completely puts down Kouta's (and indirectly her new husband's) otaku habits. Kouta's nonplussed response makes the scene all the more gratifying.
The chapter that reveals that Nozomi never loved Kouta from the start, and her real love interest is Nicchi. To top it off, she's come to take Kanau and Tsukamu away from their fathers, with Nicchi helping her.
Wife Husbandry: Used to prevent an attempt to seize property from Taeko.