俺の妹がこんなにコスプレなわけがない “Ore no Imōto ga Konna ni Kosupure na Wake ga Nai” “My Little Sister Can’t Be Cosplaying Like This”

After Kirino gets annoyed with her for not understanding certain aspects of her hobby, Ayase asks Kyosuke 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, Kyosuke 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, Kyosuke has to make sure Kanako doesn’t spot her. Kanako manages to put on a winning performance and win the prize and, despite the disgust she felt towards the otaku fans, admits that she had fun while doing it.

Sora decides to follow everyone at the beach, but at the moment she got off the bus, news that a young man was rescued from drowning unconscious. As Sora looks over, she finds out that the boy in question is Haruka. However, Nao acted quickly and performed mouth-to-mouth resuscitation. With that event, Sora becomes even more insecure, eventually telling Haruka not to leave home and tells all sorts of excuses just to make him stay. One day, Sora made Haruka choose between her and Nao, but he just shrugs it off and proceeds to school with Nao as if nothing is wrong. That afternoon Haruka finds Sora missing after receiving a text from her saying “Let’s leave here.” Akira, Kazuha, and Ryouhei joins Nao and Haruka in search of her, until, amidst the rain, Nao finds Sora at the bus stop. Refusing to go with Nao, Sora runs out of the bus stop, angrily telling her that she is the reason why Haruka has changed. Suddenly, a bolt of lightning strikes the bus stop and burst into flames. Sora then remembers she forgot her stuffed bunny inside. Nao rushes in to retrieve the only memento Sora has of her mother, causing her to be nearly trapped inside. After receiving the rescued item, Sora reveals to Nao her insecurities with her, that she is afraid Haruka would leave her alone. The next night, Sora joins everyone during the Summer Festival at the shrine. This time, Sora is more receptive of Nao.

俺の妹がこんなにエロゲー三昧なわけがない “Ore no Imōto ga Konna ni Erogē Zanmai na Wake ga Nai” “My Little Sister Can’t Be Absorbed into Eroge”

Kirino gets a long awaited eroge 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 Kyosuke, who is trying to study in the next room, Kirino gets really interactive with the eroge. 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.

By now Sora is showing her hatred of Nao in the open, even in front of Ryohei and Nao herself. One afternoon Sora, attracted by the smell of curry cooking in the kitchen, catches Haruka and Nao making love in the living room. Sora throws Nao out of the house, warning her not to see Haruka ever again, since it is the second time she catches the two doing the “dirty deed.” She then throws the curry they cooked down the drain, as she only wants Haruka’s cooking. Nao is desolate after that, and though she wants to see Haruka, she has to hide because Sora is always nearby. However, Haruka is always optimistic Sora will forgive and accept them both, as he, after knowing from Ryouhei that she changed, wants Nao to return to being a cheerful, caring, and lighthearted person. Sora lightens up a bit to the sight of Haruka and Nao being together, but still has some resistance, and prefers to distance herself from the two. It is for this reason that she never joined Haruka and Nao along with Ryouhei, Kazuha, Akira, and Motoka for the annual summer trip to the beach.

俺の妹がこんなにアニメ化なわけがない “Ore no Imōto ga Konna ni Anime-ka na Wake ga Nai” “My Little Sister Can’t Be Animated”

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 Kyosuke takes Kirino’s place at the next meeting in order to plead her case. During the meeting, Kyosuke 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, Kyosuke tells Kuroneko and Saori to keep his involvement a secret from Kirino. Kuroneko questions Kyosuke’s dedication to his sister and then expresses envy at having older siblings. Later, Kirino tells Kyosuke that the next life counseling will be the last.

This episode replays the event where Sora asks Haru to take her measurements so she can have a uniform made. The next day Nao comes over to bring Haruka some mosquito repellent, since Sora is scared of mosquitoes, and then leaves almost immediately. The next day Ryouhei invites Haruka to the school rooftop to take a peek at the girls cleaning the pool. Haruka warns Ryouhei, though, not to peek at Nao, and leaves. Much later Ryouhei tells Nao that Haruka, “the prince she has been waiting for,” has a crush on her; but she thinks he does not like her. The truth is that something happened between the two many summers ago: Nao, trying to escape the noise of her arguing parents, ran to Haruka’s house. At that time Haruka was sleeping at their veranda, and was surprised to see Nao on top of him with her clothes undone. Until now Nao feels guilty for what she did. However, Ryouhei, even Akira and Kazuha, is into the act of bringing Haruka and Nao together. They did so by making the two meet at school pool on a Sunday. When they were changing after the swimming lesson, Haruka rushes into the girls’ locker room when Nao was scared by a black cat inside a box. The school supervisor hears their chatter, but the two were able to hide inside a box before he catches them. Thinking it was just the cat, he leaves. There, Nao gets to know that Haruka does not hate her, only that he was just surprised at the events of that summer day, dispelling her assumptions. Meanwhile, Sora shows her hatred of Nao, whom she thinks is the reason why Haruka has been preoccupied the past couple of days, at home on her laptop.

俺の妹がこんなに小説家なわけがない “Ore no Imōto ga Konna ni Shōsetsuka na Wake ga Nai” “My Little Sister Can’t Be a Novelist”

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 Kyosuke around the city on Christmas Eve. She manages to get Kyosuke to buy her some earrings, claiming that they were for emotional support. When Kyosuke 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, Kyosuke feels closer to Kirino as he notices her warm smile while wearing the earrings that he bought her.

Haruka enters Akira’s room and stops her from burning something, which is her mother’s missing journal, where it is written that Kazuha and Akira has a chance of mistaken identity. With the journal, he suggests to Yahiro and Kazuha a DNA test to prove things once and for all. Yahiro refuses, but, despite disapproval from her mother, Kazuha agrees. Haruka informs Akira at the shrine the next day that the DNA results will be out in five days, but Akira disappears on the fifth day. Haruka finds her at the train station, where they talk until the evening. When the DNA results arrive that night, Kazuha and Sora delivers it to Akira, who is still at the station, but she buckled, too scared to read it. It is then that Kazuha’s mother appears, and tells everything at their home, where Akira is shown the lost pendant, returned to her by someone who found it at the mountains, basing on the name engraved on its back. She reveals that she and Akira’s mother had shared the same hospital room, and, one day Akira pulled the pendant off of her neck as Mrs. Migiwa held her in her arms. After hearing that Akira’s mother had died, she gave the pendant to her to make her feel, at least, the presence of a mother. Akira then reads the DNA results, and it read negative, which means Akira is born of a different mother. There, Kazuha’s mother let her keep the pendant, and apologizes to Akira. She later confesses her love for Haruka and vice-versa.

俺の幼馴染がこんなに可愛いわけがない “Ore no Osananajimi ga Konna ni Kawaii Wake ga Nai” “My Childhood Friend Can’t Be This Cute”

At school, Manami invites Kyosuke over to her house to try out some sweets made by her family’s shop for a Halloween event. One of Kyosuke’s friends points out that he and Manami are pretty close, but Kyosuke denies there is anything romantic; however, he admits he would not allow any guy to go out with her. Later at Manami’s house, Kyosuke 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. Kyosuke 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 Kosaka house, Kirino is noticeably frustrated that Kyosuke is staying over at Manami’s house.

The Introduction to this episode replays the event where Haruka was standing near the girls locker room, overhearing Akira’s and Kazuha’s conversation, but this time, instead of walking away mislead, Akira comes out and takes the phone from Haruka. This allows for the story to have an alternative ending. Haruka notices that Akira has been acting strange lately, and decides to talk to her alone at school the next morning. He sees the sad look on Akira’s face and becomes worried, and wants to help Akira find her mother’s pendant (after remembering her losing it as a child). They go in search for the pendant by a tree they would play by as kids, only to Haruka’s horror that the tree had been removed by a landslide. He attempts at digging around for it, but without any luck. The two go to Akira’s residence to take a bath, and have a romantic moment together. From there, Haruka goes to the festival, and, after seeing Akira cry while dancing the sacred dance, rushes off to see what had happened.

俺の妹の親友がこんなＸＸなわけがない “Ore no Imōto no Shin’yū ga Konna Batsubatsu na Wake ga Nai” My Little Sister’s Best Friend Can’t Be This XX"

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, Kyosuke 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 eroge. Kyosuke 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 Kyosuke 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 eroge. When Ayase still has doubts about her hobby, Kyosuke 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, Kyosuke receives a text from Ayase thanking him for helping her and Kirino make up, though warns him not to do anything indecent to Kirino.

On their way home from school, Haruka and Kazuha are interrupted by a frantic Yahiro, who is concerned over the non-appearance of the always-responsible Akira as usual. They discover Akira at her home, collapsed due to exhaustion, and Kazuha proceeds to blame herself and her infatuation with Haruka for not noticing Akira’s condition. Akira recovers a few days later, but confronts Kazuha about her abandonment of Haruka and the inappropriate sense of guilt she feels regarding their father’s actions. Realizing the truth of Akira’s words, Kazuha withdraws into a state of depression while struggling to determine what to do. The day of the festival arrives, and Kazuha works up the courage to appear, where she is reunited with Haruka. Haruka informs Kazuha that her father had been supporting Akira financially in secret all this time and, when Kazuha witnesses her father praising Akira, she realizes that she had misjudged him. Thus, she was able to move past her codependency towards Akira and pursue a whole-hearted romantic relationship with Haruka.

俺の妹が夏コミとか行くわけがない “Ore no Imōto ga Natsu Komi Toka Iku Wake ga Nai” “My Little Sister Can’t Be Going to Summerket”

When Kirino forces Kyosuke to play a beat-em-up eroge, 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 Kyosuke 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 Kyosuke on Kirino’s behalf and exchanges phone numbers with him. As way of apology for the incident, Kirino forces Kyosuke 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.

When Kazuha realizes that Haruka has overheard their conversation, she chases him down to clear up any misunderstanding. She reveals that Akira is, in fact, her illegitimate older sister, born of a different mother. Due to her family’s societal standing, Kazuha’s father is not able to acknowledge Akira as his daughter, causing Kazuha to be resentful of her father and to feel a burden of guilt and responsibility towards the always-hard-working Akira. To help lift Kazuha’s spirits, Haruka invites her out on a date, and they subsequently realize and admit their rapidly-progressing feelings towards each other. Meanwhile, Akira continues to try her best on her own, but collapses, apparently due to exhaustion.

俺の妹がこんなに可愛いわけがない “Ore no Imōto ga Konna ni Kawaii Wake ga Nai” “My Little Sister Can’t Be This Cute”

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 Kyosuke to catch up with her. After seeing Kirino show no desire to give up a part of her life, Kyosuke stands up to his father for her. Though he allows Kirino to keep her hobby, he still shows concern for the eroge Kirino had been seen with, so Kyosuke claims they are his, earning him a punch in the face. Kirino later gives her thanks to Kyosuke, who is taken aback by her unexpected cuteness.

Sora asks Haru to take her measurements so she can have a uniform made, and finally starts attending school with Haruka, though she is disappointed to find that she and Haruka are in different classes. While cleaning the swimming pool as part of a mixed gym, Akira accidentally soaks Kazuha who forgot her swimsuit, and so Akira takes her to dry off. Haruka finds Kazuha’s phone and goes to return it, only to overhear a sensual-sounding conversation in which Kazuha addresses Akira as “Onee-chan” (big sister).

俺が妹とオフ会に行くわけがない “My Little Sister Can’t Bring me to an IRL Meet” “Ore ga Imōto to Ofu Kai ni Iku Wake ga Nai”

Noticing Kirino has no one to share her hobbies with, Kyosuke 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 Kyosuke finishes the game Kirino asked him to complete.

After the sudden death of their parents, Haruka and his twin sister Sora move to the house formerly inhabited by their late grandfather, in a small village they often visited as children. There, Haruka encounters several of the residents, some of whom are old friends, but Sora stays at home, refusing to go to school even as Haruka starts attending. Realizing that Haruka is growing more and more distant and slipping from her grasp, Sora goes to Haruka’s room at night and appeals to Haruka as she removes her clothes…

俺が妹と恋をするわけがない Ore ga Imōto to Koi o Suru Wake ga Nai My Little Sister Can’t Be My Love

After bumping into his little sister, Kirino, in the hall, Kyosuke Kosaka finds a magical girl anime DVD which contains a little-sister themed eroge (an adult game) inside. Kyosuke 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 Kyosuke into her room, where she reveals her secret stash of erotic games and anime, 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 Kyosuke, who promises to keep her obsession a secret from their parents, to play through one of her eroge for an unbiased opinion.

“Visit!” “Hōmon!” (訪問!)

Set before episode 23, Nodoka arrives in the clubroom with a sample of the graduation yearbook. The yearbook needs to be checked by Sawako, who is sick with a cold. Curious about what her apartment looks like, the girls decide to pay her a visit. While looking through the album, they find a mysterious hand in the group photo, which turns out to be Ritsu’s. Despite Sawako’s objection, the girls decide to help her out around the apartment. They briefly visit Azusa, who is busy rehearsing for her freshman reception with Ui and Jun.