| ShortSummary | - At school, Manami invites Kyōsuke over to her house to try out some sweets made by her family's shop for a Halloween event. One of Kyōsuke's friends points out that he and Manami are pretty close, but Kyōsuke denies there is anything romantic; however, he admits he would not allow any guy to go out with her. Later at Manami's house, Kyōsuke tries out the sweets made by Manami and ends up helping her family prepare for the event; he agrees to spend the night. Manami's grandpa tricks them into sharing the same room that night, which prompts them to talk. Kyōsuke reveals to Manami that if he was confessed to, he would reject the confession in order to maintain his peaceful lifestyle. Meanwhile, back at the Kōsaka house, Kirino is noticeably frustrated that Kyōsuke is staying over at Manami's house.
- Kirino hangs out with Saori and Kuroneko again and is surprised to find that they do not have to worry about hiding their hobbies. Later that day, Kirino's father learns of her hobby and becomes angry at her. Kirino becomes upset that her hobby has been called "worthless" and runs off, prompting Kyōsuke to catch up with her. After seeing Kirino show no desire to give up a part of her life, Kyōsuke stands up to his father for her. Though he allows Kirino to keep her hobby, he still shows concern for the adult games Kirino had been seen with, so Kyōsuke claims they are his, earning him a punch in the face. Kirino later gives her thanks to Kyōsuke, who is taken aback by her unexpected cuteness.
- While Kirino's novel becomes increasingly popular, her editor reveals that it may be adapted into an anime. Overjoyed, she invites Saori and Kuroneko with her to the anime staff meeting. However, she is shocked at the number of changes the anime staff requested, most notably changing the lead protagonist from female to male. Kirino collapses from exhaustion after returning home, so Kyōsuke takes Kirino's place at the next meeting in order to plead her case. During the meeting, Kyōsuke begs the anime staff to reconsider Kirino's decisions, with Kuroneko also providing her opinions, both for and against. After some back and forth, the anime staff finally agree to some of their requests. On the train ride home, Kyōsuke tells Kuroneko and Saori to keep his involvement a secret from Kirino. Kuroneko questions Kyōsuke's dedication to his sister and then expresses envy at having older siblings. Later, Kirino tells Kyōsuke that the next life counseling will be the last.
- After running into her at the supermarket, Kyōsuke invites Manami over to his house to help him make lunch. However, Kirino isn't too pleased with having Manami around and makes various plans to hamper her visit, ranging from giving her arduous tasks to laying embarrassing pornographic traps in Kyōsuke's room. Later, Saori holds a 'personal harem party' for Kyōsuke with Kirino, Kuroneko and herself dressed as maids. There, Kuroneko shows off a perverted manga with characters based on Kirino and Kyōsuke, and later even starts calling him "nii-san" much to the ire of Kirino. Kyōsuke has a small outburst at Kirino for her behavior, until she gives him a present, saying she is grateful for all his help.
- When Ayase suspects Kirino is hiding something, she puts pressure on her and eventually discovers her hobby, telling her they can no longer be friends. Noticing Kirino falling into despair, Kyōsuke resumes his life counseling duties and tries talking to Ayase, who says she wants to make up with her, but cannot accept her hobby having seen reports of crimes relating to adult game. Kyōsuke asks for advice from his father, who helps him by giving the full story on those reports. Although Ayase still refuses to make up with Kirino after Kyōsuke reveals the truth behind the news story, Kirino gains the courage to stand up to her and expresses her love for both her friends and adult game. When Ayase still has doubts about her hobby, Kyōsuke puts on a bold act, which causes Ayase to hate him. However, Ayase realizes that her fight with Kirino is pointless in comparison and apologizes to Kirino for her harsh words. Shortly after, Kyōsuke receives a text from Ayase thanking him for helping her and Kirino make up, though warns him not to do anything indecent to Kirino.
- One morning, Kyōsuke is surprised to find Kirino behaving politely to him. That evening, while Kyōsuke worries about whether she is forcing an act in front of everyone, Kirino uses her final life counseling session to ask Kyōsuke to buy her an adult game that is launching at midnight in Akihabara. As Kyōsuke gets in line, he runs into his classmate, Akagi, who is buying a yaoi adult game for his own sister. Meanwhile, Kuroneko calls Kirino about the cat ears she is making for her and also tells Kirino that she might be going to change "her way of calling" Kyōsuke. After Kyōsuke gets back home with the game, Kirino asks him to play with her. Later that night, Kyōsuke learns that Kirino plans to leave home for America in the morning for track and field training, which disappoints him since she never told him about it before. Kirino becomes enraged when Kyōsuke does not show the behavior she expected of him and beats him up. The next morning, Kirino decides not to go, and later also announces to Kyōsuke her life counseling is not over yet, which makes Kyōsuke happy.
- Noticing Kirino has no one to share her hobbies with, Kyōsuke asks for advice from his friend, Manami Tamura, who suggests that she make some otaku friends. Kirino joins an online community and is invited to an otaku tea party at a maid café in Akihabara, but has trouble talking to any of the other members. However, she is later asked to join members Saori Vageena and Kuroneko, the latter of which gets into a heated debate with her about their favorite anime. After a day of shopping around Akihabara, they decide to keep sharing messages while Kyōsuke finishes the game Kirino asked him to complete.
- Kirino gets a long awaited adult game in the post and spends the entire day playing it, despite some frustration in the beginning when one character is cold towards her. Unfortunately for Kyōsuke, who is trying to study in the next room, Kirino gets really interactive with the adult game. Meanwhile, Kuroneko stays at home and tends to her little sister, who is a Meruru fan. Elsewhere, Saori plans for a maid-themed party for Kirino and Kuroneko.
- Having read Kuroneko's fanfiction online, Kirino decides to write some of her own. The two of them get into a fight concerning their literature tastes. After Kirino posts her novel online, she receives a tentative publishing offer. In order to get inspiration for her next novel, Kirino drags Kyōsuke around the city on Christmas Eve. She manages to get Kyōsuke to buy her some earrings, claiming that they were for emotional support. When Kyōsuke claims that Kirino is doing this simply for her own self-gratification, she pours a bucket of cold water over her head to prove otherwise. They stop by a hotel so Kirino can shower and change her clothes. Out on the streets again, Kyōsuke feels closer to Kirino as he notices her warm smile while wearing the earrings that he bought her.
- After Kirino gets annoyed with her for not understanding certain aspects of her hobby, Ayase asks Kyōsuke to give her advice on a present she can give her to make up with her. After shopping around with Kuroneko and Saori for ideas, Kyōsuke learns of a cosplay contest offering a rare Meruru figurine for the winner. With Ayase objecting to cosplaying, they manage to trick her model friend, Kanako Kurusu, into cosplaying as Meruru for the contest. However, when they spot Kirino in the audience, Kyōsuke has to make sure Kanako doesn't spot her. Despite her loathing of the situation, Kanako manages to put on a winning performance and win the prize, admitting she had a little fun doing so, though shows an utter disgust to her otaku fans.
- After bumping into his little sister, Kirino, in the hall, Kyōsuke Kōsaka finds a magical girl anime DVD which contains a little-sister themed adult game inside. Kyōsuke soon learns the game belongs to Kirino and confronts her about it, though says she would not be weird for having such a hobby and would offer his advice any time. Later that night, Kirino brings Kyōsuke into her room, where she reveals her secret stash of erotic games, explaining that she loves little sister types, though is unable to explain how she got into it. Having not had anyone to share her hobby with, Kirino gets Kyōsuke, who promises to keep her obsession a secret from their parents, to play through one of her adult games for an unbiased opinion.
- When Kirino forces Kyōsuke to play a beat-em-up adult game, he asks Saori for some playing advice. While Kirino has her school friends over, she receives a package from Saori, unaware it is a collection of dōjinshi, forcing Kyōsuke to stop her from opening it in front of her regular friends, but his attempts to protect it from her land them in an even more awkward situation. Afterwards, one of Kirino's friends, Ayase Aragaki, apologizes to Kyōsuke on Kirino's behalf and exchanges phone numbers with him. As way of apology for the incident, Kirino forces Kyōsuke to take her to Summer Comiket, along with Saori and Kuroneko. When a special data disc Kirino wants is sold out, Kuroneko wins it for her in a beat-em-up contest. Just as they leave the Comiket, they are spotted by Ayase.
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