[[quoteright:310:http://static.tvtropes.org/pmwiki/pub/images/hozukisanchinoaneki_5121.jpg]]

Life for highschool student Hozuki Gorou is anything but easy. His attractive older step-sister Haru aggressively flirts with him, lies to him, and humiliates him in every way she can think of. However, he does have a crush on her, which nonetheless causes even more trouble for him.

Serialized on Young Ace, this 4-koma crack comedy by Igarashi Ran is about the wacky day-to-day life and interactions of the Hozuki siblings.

A sequel began serialisation in the April 2014 issue of Young Ace titles 'Hoozuki-san Chi no Aneki + Imouto', seemingly taking place at the end of Gorou's last year of high school/shortly before college exams. As the title says, Haru's cousin, Aoi, one year younger than Gorou, comes to live with them as their imouto. The sex is turned up in this series, especially by Aoi.

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!!This manga contains examples of:
* ADateWithRosiePalms: What we can only assume Misaki did to become "refreshed" after drinking an aphrodisiac.
* AbhorrentAdmirer: Played with in Misaki's case. She's portrayed as an attractive girl in the manga, but is so insanely determined in her pursuit of Gorou and her S&M fantasies that the poor boy is terrified of her.
* AccidentalPervert[=/=]ColdTurkeysAreEverywhere: Gorou. And it's entirely Haru's fault.
* AcquiredPoisonImmunity: According to chapter 29, Misaki has drugged Gorou so many times that light doses no longer seem to affect him.
* AlliterativeName: Haru Hozuki and Kyosuke Kousuke. Mai Mizuno as well.
* AmusingInjuries: Gorou
* AttentionWhore: Haru.
* BarbieDollAnatomy: Works in the case of Kyou, to the point where even Gorou didn't clue in that Kyou's actually a girl.
* BastardGirlfriend: Although, in this case, it's a sister, not a girlfriend.
* BearsAreBadNews:
** Somehow Haru was able to chase Gorou around while riding one once.
** She also convinced him to attack one once so that she could escape.
* {{Bifauxnen}}: Haru's androgynous classmate Kyou, who's exploited by her to make Gorou jealous.
* BishieSparkle: In chapter 23, when Kyou is dressed as Romeo for the cultural festival.
* BigDamnHeroes: Haru saves Gorou from [[RapeIsLove being raped]] by Misaki in Chapter 22.
* BigSisterInstinct: Haru around Misaki.
* BlackComedyRape: There's no low that Misaki won't stoop to in order to get Gorou.
* BlatantLies: Haru is prone to telling them, mostly to abuse Gorou in some way shape or form. This is even [[LampshadeHanging pointed out]] in one with the words "complete lie".
** No one ever believes Gorou that they are lies. His classmates have a pretty low opinion of him. Then again he does always lie about his sister complex.
** Gorou realizes in one strip that Haru is really sick because her lies [[NonSequiturThud stop making sense]].
* BringMeMyBrownPants: When Gorou saw Haru with a Franchise/{{Predator}} mask.
** And the fact he can't stand Horror at all.
* BrotherSisterIncest:
** Gorou's head over heels in love with his ''[[NotBloodSiblings stepsister]]'' Haru, but shows no interest in his ''actual'' sister Kaede.
** Kaede, for her part, seems to think Haru's crushing pretty hard on Gorou. And also that it's very not right.
* ButtMonkey: Gorou, Gorou, Gorou.
** IronButtMonkey: He once fought a bear while getting shot at by hunters and another time got mauled by a killer whale. He managed to stumble out of both situations relatively unscathed.
* TheChewToy: Gorou does not seem to mind much. He even thanks Haru one time after she drops a cake on him. He seems to put up with it because it shows that she's clearly thinking of him as much as he does her.
* ClingyJealousGirl: Misaki
* CoolBigSis:
** Haru can be this for Gorou when she's not trolling him.
** Kaede qualifies as well.
* CoolShades: Gorou wears a pair when he first meets up with Haru and her friends at the resort.
* CowardlyLion: While Gorou is a scaredy cat, he will not hesitate to intervene if he believes that Haru is in any danger of sorts.
* EarCleaning: Except Haru uses her ''tongue'' instead of an ear pick.
* {{Ecchi}}: It's [[BarbieDollAnatomy not very detailed]], but there sure is a whole lot of exposed female flesh in this manga.
* EroticDream: Gorou has one on New Year's Day and subsequently refuses to tell Haru about it.
* EvenTheGirlsWantHer: Kyou has her own fanclub thanks to her status as a {{bifauxnen}}.
* FieryRedhead: Haru
* {{The Gadfly}}: Haru, in every way, [[DepartmentOfRedundancyDepartment to everyone, ever]]. Teases Gorou about his crush on her, embarasses him in public as often as possible, tricks Kyou into dressing as masculine as possible to mess with both of them, etc. Hell, her FanNickname is ''Trollsis'' for crying out loud.
** Only Kaede is immune.
* GirlsAreReallyScaredOfHorrorMovies:
** Inverted - Gorou is really scared of horror movies. Haru on the other hand really likes them, if only because she knows Gorou doesn't but will watch them with her anyway.
** Played straight with Kyou, one of the few feminine traits she exhibits.
* GodivaHair: Kaede in her second appearance.
* GoneHorriblyWrong: Haru attempts to ward off a classmate who has feelings for Gorou by telling her of his porn and the sexual acts within. However said classmate was Misaki and it only serves to [[FetishFuel aro]][[CovertPervert use]] her.
* HeroicBSOD: Gorou concerning Haru's graduation.
* HeroicComedicSociopath:
** Haru's one and only mission is to make Gorou's life pure hell in the most [[RuleOfFunny amusing]] ([[{{Fanservice}} and hot]]) ways.
** Chapter 21 shows that her behavior may actually have had good intentions, at least to begin with. When Haru and Gorou first began living together, he was a {{hikikomori}} who showed no response to any attempt by her to socialize with him... until she started teasing him and playing pranks on him like she does now.
* HeroesWantRedheads: Gorou for Haru.
* HiddenDepths: Gorou happens to be skilled at standing yen coins on their edges, a feat that manages to impress Haru.
* {{Hikikomori}}: Gorou used to be one until Haru came into his life.
* HypocriticalHeartwarming: Anytime some guy attack Gorou, Haru will kick your ass.
* IdiotBall: Gorou isn't exactly the sharpest tool in the shed, but even he has his moments. One particular moment had him open a booby-trapped cabinet that was "helpfully" labeled by Haru, resulting in him getting a face full of detergent and falling onto a pile of clothes.
* IllGirl: Mizuno. Her family is extremely worried about her health, which annoys her to no end and has given her a rather bitter personality.
* ImportantHaircut: [[spoiler:Haru]] gets one in Chapter 28.
* {{Jerkass}}: Haru's friend Meiko. Haru's mean to people because she obviously thinks it's funny. Meiko seems to be mean to people [[ForTheEvulz for pretty much no reason at all.]]
** {{Tsundere}}: Starts showing shades of this as their relationship progresses.
* [[spoiler:LetsJustBeFriends: Gorou and Mizuno, as of Chapter 26. It's played as mutual on both ends - Mizuno having trust-level issues, and Gorou trying to consolidate who he actually has romantic feelings for]]
* LoserProtagonist: Gorou. It's shown that he basically has no friends and he spends all his free time being tormented by his sister, obsessing over her, or playing video games.
* LovePotion: Misaki's modus operandi.
* LoveTriangle: Between Gorou, Haru, and Mizuno.
* MsFanservice: Haru, so very much. Kaede seems determined to take this trope too.
* NightmareFetishist: Haru is especially fond of scary pranks.
* {{Nosebleed}}: Hoo boy. Gorou could give [[NagasareteAirantou Ikuto]], [[LightNovel/BakaToTestToShoukanjuu Mussolini]], [[MariaHolic Kanako]] or {{Karin}} a run for their money in the "Plasma-gushing-from-head" department. There's even one point where, after his friend mentions the possibility of Haru getting married, Gorou spurts blood out of ''every crack in his skull''. Have the poor boy see a doctor.
** Also another when he tries to delete his photo collection of Haru his hand splurts out blood.
** OverdrawnAtTheBloodBank
* NotBloodSiblings
* NotWhatItLooksLike: When Gorou spills water on his game console (an Xbox 360) as well as his pants, he grabs some tissues to dry them off. Haru walks in on him and naturally assumes the worst.
* [[TheOnlyOneAllowedToDefeatYou Only One Allowed To Pick On You]]: Haru to Gorou.
** HypocriticalHeartwarming
* PantyShot: Part of being MsFanservice, so Haru gets this a lot.
* PetTheDog:
** Haru gets one at the end of the kotatsu segment in chapter 8 where she decides to let Gorou sleep instead of scribbling on his face with a marker.
** When Gorou was beat up for attempting to save Haru from the attention of the {{delinquent}} hitting on her, she seemed genuinely worried about him being hurt. Probably the first time in the manga she'd been sincerely nice to him.
* TheQuietOne: Mei
* RecursiveCrossdressing: Kyou, who Gorou thinks is a guy, plays Juliet in a production of RomeoAndJuliet put on by her and Haru's class.
* RichPeople: A 4-koma side story revealed that Misaki has access to a butler.
* RunningGag:
** Misaki's schemes to get Gorou for herself which often border on rape.
** Gorou will never believe Kyou is a girl even when she is wearing a skirt.
* SecondYearProtagonist: Gorou
* SheCleansUpNicely: Any moment when Kyou dresses in a girly skirt.
* ShorterMeansSmarter: Haru is the shortest character amongst her friends.
* ShoutOut: Haru once wears a Franchise/{{predator}} mask in one of her schemes.
* SitcomArchNemesis: Gorou and Kyou
* SleepCute:
** Haru uses this for evil.
** Later played straight.
* SliceOfLife
* SmokingIsCool: Kaede
** OralFixation
* SuperDeformed: Often
* SpellMyNameWithAnS: Hozuki/Houzuki/Hoozuki/Hōzuki. Thanks to the wonders of the Japanese-to-English translations, they're all technically right.
* StalkerWithACrush: Haru's classmate Misaki, for Gorou.
* StringyHairedGhostGirl: Mizuno at times.
* SugarAndIcePersonality: Mizuno's approach to Gorou.
* SuperDrowningSkills: Gorou cannot swim without a float, even in ''the shallow end''.
* TheTease: Haru.
* ThanksForTheMammary:
** Haru once pushed Gorou over and he landed on Mizuno, his hands hitting something other than the icy ground.
** Gorou got another handful when he tripped over a curling iron and fell into Mizuno from behind.
* UmbrellaOfTogetherness: Gorou and Mizuno share an umbrella at the end of chapter 18.
* UnkemptBeauty: Kaede, and to a lesser extent Mizuno.
* UnwantedHarem:
** There's one developing around Gorou with Misaki, Mizuno, and Kyou - though this is tempered by the fact that Gorou is a) deathly afraid of Misaki b) unsure of what Mizuno thinks of him (or vice versa) c) convinced [[{{Bifauxnen}} Kyou's a guy]] and d) too smitten with Haru to consider them anyway.
** Haru always gets pretty jealous whenever he is with another girl. Whether this is just her being evil and possessive or actually liking him are very hard to tell.
* WeNamedTheMonkeyJack: Kaede owns a dog named Gorou and in a 4-koma side story gets him to rip apart an effigy of Haru.
* WhamEpisode[=/=]MoodWhiplash: [[spoiler:Almost literally]] by the end of chapter 25. Ouch.
* WholeEpisodeFlashback: Chapter 21 which details the time Haru and Gorou first started living together and Haru's attempts to connect with Gorou.
* WouldHitAGirl: [[spoiler:During Gorou's fight with Mizuno in chapter 26.]]
* {{Yonkoma}}: Most of the manga, though it often switches to a regular format for a few pages.
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