Warning: spoilers
One month after the events in the first novel, Kyousuke is still a normal guy, except for the fact that he’s being forced to play imouto-themed eroge by his little sister, Kirino — fortunately in the privacy of his own room.
Through a wiki, Kyousuke learns the mechanics of “Siscalpyse“, a highly-customizable fighting game where loli imoutos fight each other — the loser also losing all her clothes. Once you gain experience playing in campaign mode, you can play online. In fact, Kirino wants Kyousuke to play with her online so she can gain experience points, since she really sucks at the game. He also meets Saori online and gets her phone number.
That day, Kyousuke learns from Kirino that some of her friends are coming over tomorrow, so under no circumstances is he to leave his room — and she suggests he could spend the time playing eroge. “Play eroge while the house is full of teenage girls? What kind of torture is that? And what if I’m caught?” ”No problem” Kirino replies “In that case I would never speak to you again and act as if you were a stranger”. At any rate, Kirino forbids him from leaving his room and talking, nay, even looking at her friends.
The following day, Kyousuke decides to browse the Internet to pass the time after being expelled from the living room by Kirino. He remembers that his osananajimi Manami is for some reason collecting pillows (no, not that kind of pillow) and searches for a present for her. He ends up on a website selling dakimakura — yet another otaku oddity.
Meanwhile, Kirino and her friends are now in her room and he can listen to their conversation. Kirino has been weird lately — she doesn’t have time for her friends, she has been texting in secret and the other day they heard her talking on her cell phone — she was arguing with someone, but after she hung up she was smiling. Conclusion: she has a boyfriend, but no matter how much they press her, she won’t tell. Kyousuke suddenly feels jealous, but he realizes that the person Kirino was talking to was probably none other than Kuroneko. Kirino tries to change the topic, faking that she’s angry (very different from the actual angry Kirino)
One of her friends then asks her about Kyousuke, and says that he looks like a nice person. Kirino curtly denies it, and the rest of the girls start bad-mouthing Kyousuke — 14-year-old girls can be really cruel — but even if Kirino was the one who started speaking ill of Kyousuke, once her friends actually are saying very cruel things about him she remains mysteriously silent.
Suddenly, someone is at the door, with a package for Kyousuke. Kirino also goes downstairs and sees that it’s a package from a famous make-up manufacturer, and thinks that it’s a present for her. Kyousuke who was expecting no package whatsoever, gives it to her, still puzzled about it. He gets a phone call then — Saori. It was a package for Kirino, but she didn’t know her real name, so she sent it to Kyousuke instead. It contains… doujinshi (she had used the empty package of make-up products she had bought overseas). “Pornographic doujinshi?” asks Kyousuke. “Of course!”
Kyousuke realizes that this is a serious situation, because she might open the package in front of her friends. He barges into her room, to the astonishment of the girls, and tries to grab the package, but Kirino is holding it tight. In the ensuing struggle, Kirino trips and Kyousuke, trying to save her from the fall, ends up on top of a Kirino whose bra and panties are now exposed. Kyousuke finally gets the package, but suddenly Kirino’s astonished friends ask them if they are in a forbidden relationship. Both deny it, and Kyousuke gets kicked out of the house until Kirino’s friends leave.
While he’s outside, a cute girl, one of Kirino’s friends, called Aragaki Ayase, approaches Kyousuke. She thinks there was a reason why he acted like that, and asks him to forgive Kirino. She also exchanges her phone number with Kyousuke, or “Onii-san” as she calls him.
Comments
For those familiar with volume 6, there are important hints here about Kirino’s relationship with Kyousuke. While Kirino tries to discourage her friends from seeing Kyousuke in a good light, when her friends bad-mouth him in a very cruel way she remains silent, as if she was actually hurt by their remarks — even one month after the beginning of the story Kyousuke’s constant claims that she hates him may become unsustainable.
In light of future events, we have to also wonder why Kirino’s zeal to prevent Kyousuke from interacting with her friends — just something typical of a teenage girl, or not wanting potential rivals?

Yay, another ore imo spoiler.
This one is very special, especially because novel’s illustration (rare fanservice appeared).
That accident appeared in front a bunch of teenage girls O_o. What a terible luck XD.
I’m rather confused with “She thinks there was a reason why he acted like that, and asks him to forgive Kirino.”
“that” refers to what act ? Is it (unintentionally) pushing down Kirino ?
Well, this time I actually forgot to warn about spoilers, sorry!
Ayase was referring to Kyousuke trying to steal Kirino’s “present” (the package). She thinks he might have wanted to give it to Kirino on a special date or something like that
Actually I don’t think that’s very relevant. What’s important is that Kyousuke meets Ayase, who is very important in this volume.
なぁ、セルちゃん
オレこのラノベ読んでないんだけどこれって妹と恋愛する話なの?
もしそうだったら読むんだけど。
これまで(6巻)恋愛関係になっていないが暗示が無数ある。京介はどんどんシスコンになってて6巻の中には桐乃が興味深いことを願った
話自体はオタクの妹のことという話がシスコンの部分が倍増している!
Hmm…this firmly places OreImo in the top 5 list of the things I must own compltely before I die.
It is my favorite light novel indeed! Looking forward to the anime this fall