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Private Notes
One morning, Kyosuke is surprised to find Kirino behaving politely to him. That evening, while Kyosuke worries about whether she is forcing an act in front of everyone, Kirino uses her final life counseling session to ask Kyosuke to buy her an eroge that is launching at midnight in Akihabara. As Kyosuke gets in line, he runs into his classmate, Kōhei Akagi, who is buying a yaoi eroge for his own sister. Kyousuke, after realizing that the trains are no longer running, manages to convince one of the other customers to lend him his bike so he can ride back home. After Kyosuke gets back home with the game, Kirino asks him to play with her. She then shows him all of the medals and report cards with bad grades she had received throughout the years. The next morning, Kyosuke learns that Kirino has left home for America for track and field training. In the beginning of the new school term, Kyosuke meets up with Kuroneko, who would be attending his school as his underclassman.
Kuroneko (real name: Ruri Gokou) enrolls in Kyousuke's school, and Saori feels downhearted that she hasn't heard from Kirino. Kyousuke notices that Ruri is having trouble making friends due to her personality, so he decides they should try a membership at their school's Games Research club where the boy meets two other persons he never expected to be there as well.
With Sena and Kuroneko constantly quarreling in the Games Development club, the club president decides they'll have to write a game together and submit it to an online contest. Both girls have different concepts about the game's theme, so they'll both present them to the club whose members will then decide by majority vote whose concept will have to be implemented. And Kyousuke, with no programming skills thus acting as supervisor for the team, suggests to write an eroge—in order to have less competition and a better chance to win the contest.
As Ruri and Sena's game is bashed on the Internet they decide to work harder towards making a better game. As Kyousuke prepares to go home he receives a text message from Kirino telling him to throw away her collection of eroge and anime goods! Kyousuke contacts Ayase who confirms Kirino hasn't been in contact with her since she left either. Kyousuke then meets up with Ruri who encourages him to fly to America to find the root of Kirino's problem—and before the boy leaves she puts a special jinx on him.
Recap of the first episode, with additional comments from the characters.
Kyosuke meets with Ruri and tells her he loves someone else. The next day, Kyosuke asks Kirino out on a Christmas date to Akihabara like they did a year previously. Kyosuke reveals that he had finally fallen in love with a girl, which upsets Kirino and causes her to run off. Giving chase, Kyosuke quickly looses sight of Kirino when at that moment Kaori, Saori and Ruri show up in a minivan. After spotting Kirino, Kyosuke jumps out of the van and corners her. Not denying his feelings any longer, Kyosuke publicly acknowledges his love for Kirino. Kyosuke then asks her to stay in Japan and marry him. Kirino tearfully accepts.
Kyosuke gives Kirino a Christmas present which turns out to be the same ring she had asked him for the year previously. Kirino reveals that she had planned on confessing to Kyosuke herself. Kirino whispers to Kyosuke an idea for handling their relationship. Time passes and the siblings formally announce their relationship to Saori and Ruri. Later, Kanako confesses her love for Kyosuke which he rejects. The next morning, Kyosuke surprisingly wakes up with Kirino in his bed. Kirino reveals a photo album containing the memories they shared together while growing up. Kirino and Kyosuke listen to the diaries she had been recording since she was young.
Kyosuke and Manami graduate from high school. After the graduation ceremony, Kirino arrives to pick Kyosuke up following the end of her middle school graduation, and both head out to meet Manami. In a park, Manami scolds them about their relationship. Manami and Kirino then get into a fist fight. Manami scolds them some more and then confesses her love for Kyosuke. Manami then punches Kyosuke and accepts his rejection. Later on, Kirino and Kyosuke have a pseudo-marriage at the church. They kiss, and then Kirino gives Kyosuke back the ring she was given before. It's revealed that Kirino's idea for their relationship was to be a couple until graduation and then go back to being normal siblings. In the epilogue Kyosuke and Kirino head to Akihabara for a meet-up with Saori and a new member. Kyosuke casually kisses Kirino on her cheek, much to her disgust.
Special Included with Volume 4 of Season 2
Special Included with Volume 6 of Season 2
For years, ordinary high-schooler Kousaka Kyousuke has had an icy relationship with his younger sister Kirino, a star athlete who is also a star student.
While being grilled by Kirino over why he hasn't made any progress in the game she ordered him to complete, it occurs to Kyousuke that she needs some friends that she can talk to without concealing her otaku interests.
Kirino finds her first otaku friends at the IRL meet: "Kuroneko" and "Saori Bajeena." They spend their days deep in discussions over their otaku interests. Seeing Kirino this way puts Kyousuke's mind at ease.
One day, Kirino's non-otaku, "public" friends—Aragaki Ayase and Kurusu Nanako—come over to visit. Kyousuke is harshly told by Kirino to not let her friends see him.
On the way home from an enjoyable Summerket. They bump into Aragaki Ayase, Kirino's best friend.
Kyousuke is asked about his relationship with Manami by his friend, Akagi. Akagi is exasperated when Kyousuke answers that, although they don't have a romantic relationship, he doesn't want her to be taken by anyone else.
Kyousuke comes home one day and is startled to find Kuroneko loitering in the living room by herself.
Kirino has made her debut as an author. Reader response has been overwhelming, and her editor has even better news to report.
Kirino has been acting strangely antsy for the past few days. The reason is that the little sister game she ordered hasn't arrived yet.
One day, Ayase calls Kyousuke out of the blue and asks him to see her. She wants to get Kirino a present, and wants him to think of what she would be happiest to get.
Sent out to buy groceries by his mother, Kyousuke bumps into Manami at the supermarket. They get to talking, and they eventually arrange for Manami to come visit for the first time in ages.
Ever since the events of the previous episode, Kyousuke has been nervous about his improved relationship with his sister.
As Kirino organisings thing with school and friends following her return from America. Kyosuke grows concerned that she might start ignoring him again due to the way he forced her to come back, as well as struggling to find the meaning behind the kiss Ruri gave him when he went to retrieve her. Later, Kirino once again calls upon Kyosuke for life consultation, having him take her to Akihabara to watch a trailer for the next Meruru season before engaging in a long-missed shopping expidition she spent the entire night planning. As thanks for his help, and to celebrate a year of life consultation, Kirino gives one of her eroge purchases to Kyosuke to play.
Feeling frustrated that Kirino is ignoring her in favour of a popular mobile game called Love Touch that lets you exchange texts with virtual girls, Ayase asks Kyosuke to do something about it. After Kyosuke brings it up to Kirino, she gives him Love Touch to avoid being tempted by it, only for Kyosuke to end up becoming addicted himself. As Ayase becomes angered upon learning of this from Manami, Kyosuke attempts to explain how the game's heroine is similar to Ayase. He suggests imitating the heroine to better hold Kirino's interest, but this is soon met with violent backlash from Ayase when dubious phrases are brought up. After Ayase goes to Manami for advice, Kyosuke is shown the error of his ways when Ayase decides to imitate the game's yandere route in front of Kirino.
As Kyosuke, Kirino and Ruri decide to visit Saori's apartment as a surprise for her birthday, they finally see what she looks like without glasses. Four years ago, Saori was a weak bodied girl who was shy about showing her face to others. One evening, she was brought by her older sister, Kaori, to a special apartment where she indulges in otaku activites alongside her flatmates, Shinya Sanada and a budding manga artist named Kanata Yamanashi. Kanata took an instant liking towards Saori and soon taught her about the otaku lifestyle. However, the circle soon starts to dwindle after Kaori left to get married, leaving Saori alone once more. Feeling betrayed by Kaori, Saori became determined to start her own circle and help others like she helped her, receiving her trademark swirly glasses from Kanata to help her on her way. This would eventually lead to the start of her otaku life and her meeting with Kirino and Ruri.
Kirino's track rival from her time in America, Ria Hagry, comes to Japan and stays over at her house. Kirino feels a bit protective of her, often dishing out punishment at Kyosuke following every little misunderstanding. Kirino and Kyosuke take Ria to Akihabara to show her Kirino's various hobbies. Afterwards, Ria challenges Kirino to a race, understanding what drove her to beat her back in America. Although Kyosuke cheers Kirino on, Ria manages to beat her, feeling proud of getting her revenge. Before leaving Japan, Ria hints to Kyosuke that he is the reason Kirino works so hard, though Kyosuke is a bit skeptical of that. After Ria leaves, Kirino brings up an odd request for Kyosuke to be her 'boyfriend'.
Kirino asks Kyosuke to pretend to be her boyfriend whilst they meet with a company director, Misaki Fujima. Misaki wants Kirino to work abroad as one of their exclusive models, forcing Kirino to have Kyosuke to act as her boyfriend as a reason not to leave. As such, they end up going on a 'date' together in order to keep up the act in case Misaki is spying on them, which proves more awkward when Manami sees them together. Whilst stopping at a place to eat, they encounter Kanako and her model acquaintance, Bridget Evans, and are forced to act in front of them too. Things become even more awkward when they encounter Ruri at the arcades. At the end of the day, Kirino becomes disappointed by Kyosuke's behaviour, saying she'll use a 'real boyfriend' next time. After Kyosuke clears things up with Ruri and hears her thoughts, he asks Kirino directly if she has a boyfriend, only to receive a cryptic response.
The boy is introduced to be Kouki Mikagami, a designer from Misaki's company who, to Kirino's surprise, is also an otaku. Later, after Kyosuke explains the 'fake date' scenario to Ayase and asks her opinion on whether Kirino has a boyfriend, things get tense at the after-party when Kirino witnesses Ruri assumedly confessing to Kyosuke. Irritated, Kirino announces that Kouki is her boyfriend, pushing Ruri to leave and angering Kyosuke with her remarks. Later, Kyosuke becomes irritated when Kirino invites Kouki to their house, receiving an angered slap from her when he shows his distaste. After speaking with a drunken Daisuke, Kyosuke grovels before Kirino, explaining his honest feelings and stating he won't allow Kirino to date Kouki until he proves himself worthy. Kirino eventually breaks down and reveals she lied about dating Kouki because she was jealous of Kyosuke and Ruri, with Kouki agreeing to pretend to be her boyfriend.
With Kyosuke unable to give her a straight answer, Ruri asks that he give her his response after the party the next day. Speaking with both Kirino and Manami, they both tell him to think over this decision carefully. During the party, Kyosuke thinks back on the past year after he began his life counselling with Kirino, whilst also taking an opportunity to tease her. After the party, Kyosuke agrees to go out with Ruri, officially making them a couple. As Kyosuke becomes stressed over how to act like a proper boyfriend, he brings Kouki along with him to the Games Research club, where the other members claim that they always knew Kyosuke and Ruri liked each other, and are surprised to learn that they decided to go out just recently. After being given some time alone, Ruri admits she has also been stressing about how to act in front of Kyosuke and simply asks that they go on a date.
While being treated by Kirino after getting his face wounded by some reason, Kyosuke reveals to her that he and Ruri decided to start dating, and much to his surprise, she does not complain about it. In their first date, Ruri wears a special cosplay she designed specially for the occasion, much to Kyosuke's astonishment. As the day pass, Ruri shows more about her tastes and preferances to Kyosuke and she reveals that it was written in a special guidebook made by her in order to attain her wish, which according to her is to have him and Kirino get on terms with each other. Despite not understanding the meaning behind her plans, he agrees to help her with it. The two then spends the following days hanging together in his and her houses, with Kyosuke being introduced to her younger sisters in the occasion, and by the end of summer break, they go to a festival together.
After hearing no word from Ruri following their alleged break up, Kyosuke is shocked to learn from Sena that Ruri has transferred schools, later finding her house completely vacated. Troubled by this, Kyosuke comes to Kirino, who gives him his own life counselling and decides to help him search for her in a hot spring town. After they eventually manage to find her, Ruri points that Kirino hadn't truly accepted her dating Kyosuke, forcing her to confess her true feelings that she didn't want him to have a girlfriend, which was the reason she passed off Kouki as her boyfriend. Kirino states that despite this, she doesn't want to see her brother cry even more than that and wants to get the two back together to repay how much he has supported her over the past year.
After hearing about Kyosuke and Ruri's breakup, Ayase becomes irritated that it had nothing to do with her. Nonetheless, she asks Kyosuke to take up his 'manager' role once more as she asked to help out at a Meruru concert that Kanako and Bridget are participating in. After hearing Kirino will be unable to attend the concert due to her work schedule, he borrows a bike from Kouki and rushes over to pick her up. After managing to get to the concert in time for ClariS to perform, Kirino feels thankful towards Kyosuke for his efforts.
Concerned by how seemingly close Kyosuke and Kirino have gotten, their parents arrange for Kyosuke to live on his own so he can focus on his exams. With Kyosuke needing to earn an A grade before he can move back, Kirino adds that if he does succeed, she'll do any one thing he asks. Later, Kanako decides to pay Kyosuke a visit in his new apartment, proving awkward when she finds an eroge Kirino lent him. She proves smart enough to guess that Kirino is his sister, but is still oblivious to her being an otaku. The next day, Ayase visits Kyosuke to deliver a housewarming present, shortly followed by Ruri, leading to an awkward and embarrassing confrontation. After Ayase takes her leave, Kyosuke and Ruri reconfirm their stance on their relationship, with Kyosuke stating he won't start dating until he settles things with Kirino.
A party is held for Kyosuke at his new apartment and Kirino arrives there just to find Manami, and despite her animosity towards her brother's classmate, she decides to put it aside for his sake. Ayase, Ruri, Saori and Kanako also attend the party, but chaos ensues when they start arguing about who among them should take care of Kyosuke as he prepares himself for the mock exams and Kirino settles it by appointing Ayase to the task. The mock exams come and thanks to Ayase's support, Kyosuke manages to earn an A grade and the right to return home. As he is preparing to move back, Ayase confesses her feelings for him, but he politely declines, revealing that he is already in love with someone else. Instead of kicking him like she usually does, Ayase kisses Kyosuke on his cheek and bids farewell to him.
Kirino reminisces on her childhood, when she was very fond of Kyosuke and always looked up to him, until he stopped giving his all and adopted a more relaxed lifestyle. Blaming Manami for the sudden change in him, Kirino confronted her, asking her to give back the brother she loved so much, just to hear from her that the Kyosuke she envisioned never existed in the first place. To get back at Kyosuke, Kirino focused to improve herself and started avoiding him. Years later, she starts working as a model and befriends Ayase, but also develops her otaku hobbies, and becomes too ashamed to share them with anyone else. The issues she had with her secret were what somehow reapproached her with Kyosuke, who since then always stood by Kirino's side to support and protect her, even though she no longer sees him as the brother she once idolized.
As Christmas Day draws near, Kyosuke ponders on Ayase's confession to him and makes a decision. The following night Kyosuke meets with Ruri and as they stand in the rain, he painfully breaks up with her by confessing his love for another girl. This brings Ruri to tears and she violently rips the notebook filled with the memories of their time together before cursing the world. The next day, Kyosuke asks Kirino out on a Christmas date to Akihabara like they did a year previously after tempting her with the chance to purchase exclusive eroge which she accepts. That night, as they exit the Tokyo Skytree, Kirino reveals her intention of going abroad once more upon her graduation and promises not to repeat her past mistakes. Kyosuke then reveals that he had finally fallen in love with a girl, which upsets Kirino and causes her to run off.
Kirino and Kyosuke head back to their hotel room to try and sort out their next move after agreeing that siblings cannot get married in real life. Kirino gets distracted with her newly bought eroge and finds that her feelings are too mixed to too concentrate on the game. Kyosuke then gives her a Christmas present which turns out to be the same ring she had asked him for the year previously, and ceremoniously puts it on her finger as a pseudo-engagement ring. Kirino reveals that she had planned on confessing to Kyosuke herself, but ran off earlier thinking that he was referring to his love for another girl. Having already given thought into their next move, Kirino shares this with Kyosuke. Sometime later, the siblings formally acknowledge their relationship to Saori and Ruri, the former of whom remains uncertain on her standpoint on the matter. After Kirino gets into her usual Meruru debate with Ruri, Kyosuke leaves to meet up with Kanako following her latest concert.
Kyosuke and Manami make their final trek to school on the day of their high school graduation. While at school, Kyosuke learns that Kaede and Sena ended up becoming a couple, whilst also getting Sena's support on his relationship with Kirino. After the graduation ceremony, Kirino arrives to pick Kyosuke up following the end of her middle school graduation, and both head out to meet Manami. As the group sit in the park, Manami becomes visibly angered upon learning of the Kosaka siblings' relationship and Kirino uses the opportunity to show off her victory in finally taking Kyosuke away from her. In a dramatic turn of events, Manami's personality suddenly changes and she violently punches Kirino, who responds equally with violent force, much to Kyosuke's horror. After Kyosuke intercepts their final punches, they both agree that they could only ever communicate through their fists.
