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.
Abhorrent Admirer: 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.
Iron Butt Monkey: 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.
The Chew Toy: 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.
The Gadfly: Haru, in every way, 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 Fan Nickname is Trollsis for crying out loud.
Gone Horribly Wrong: 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 arouse her.
Haru's one and only mission is to make Gorou's life pure hell in the most amusing (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.
Idiot Ball: 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.
Ill Girl: Mizuno. Her family is extremely worried about her health, which annoys her to no end and has given her a rather bitter personality.
Tsundere: Starts showing shades of this as their relationship progresses.
Let's Just Be Friends: 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
Loser Protagonist: 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.
Nosebleed: Hoo boy. Gorou could give Ikuto, Mussolini, 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.
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.
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 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.
We Named the Monkey Jack: Kaede owns a dog named Gorou and in a 4-koma side story gets him to rip apart an effigy of Haru.