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.

つばさキャット 其ノ伍 Tsubasa Cat Sono Go Tsubasa Cat - Part 5

つばさキャット 其ノ肆 Tsubasa Cat Sono Yon Tsubasa Cat - Part 4

After supressing the bakeneko, Oshino explains Hanekawa’s situation to Araragi. Araragi realizes that he may need Shinobu’s powers to help him bottle up the oddity. The problem escalates when Araragi learns that Shinobu has gone missing.

“The Student Council’s Discretion” “Seitokai no Ichizon” (生徒会の一存)

Continues off Mafuyu’s Confession leading Kurimu on the topic “Future Visions” asking each of the Student Council what are their plans. A new character comes making Mafuyu jump in joy which she tries to get Ken involved. Nakameguro was guided to the council being a transfer student asking Ken to assist him on his way home. Nakameguro goes on saying that Ken is amazing and he’s strong but Ken disapproves his point of view saying he is weak without the help of the student council. Ken goes on explaining how he was saved by each of the student council during his first year as the Seasons went by.

“The Fragmented Student Council” “Kakeru Seitokai” (欠ける生徒会)

In the beginning Ken talks to “Yuki” what he can do to change but gets teased rather than get a serious answer…yet. A flashback shows how Ken and Mafuyu “met”. In the student council Ken left due to cold as the Kurimu and Minatsu try to make a serious meeting with the topic about “Part-Time Jobs” also finishing up the paperwork. In the end Mafuyu suggest to go visit Ken which they decided to go. The Student Council run into Ken’s “classmates” who went with him during Junior High telling the story how he “Two-timed”. Kurimu fights back telling them he said “Yes” that the girls now are happy till they insulted him again making Mafuyu bashes one of them with her bag. The Student Council taught them a lesson as Lilicia makes an appearance stating “the journalism club is meant to make false stories of the Student council.” Ken is then nursed by everyone. Mafuyu finally confesses to Ken.

“Tidying Student Council” “Katazukeru Seitokai” (片付ける生徒会)

Its the day of the Hekiou Festival, the Student Council discuss how to make a “Tear Jerking Story” but in the end they thought it to be hard. Just as the festival ends they try to sort out the “lost and found” items to verify what belongs to who. In the end after Kurimu gives her grant speech Ken was just about to be left alone until everyone agreed to stay and help finish up the remaining work.

“My Student Council” “Watashi no Seitokai” (私の生徒会)

The Student Council begins their topic “Reading Books” as Ken asks what books the rest of the Student Council are reading. Chizuru jokes about the “book” that Ken assumes in despair telling him that she wanted to read instead the Love Fortune’s book. After Chizuru does a handshake fortune-telling Kurimu interrupts the fortune saying she wants the book. Chizuru informs everyone the first to react is jealous while leaving she thanks Ken leaving a letter for the Council to read.

“Student Council Envies” “Shitto suru Seitokai” (嫉妬する生徒会)

Ken causes a commotion when he shows up to the student council office with a mysterious girl. He explains that he is looking after Elise, Lilicia’s younger sister until she comes pick her up. String figures, Shiritori, and more child’s games, but for some reason Elise can turn these games into something much deeper.

“Student Council Steps Out” “Fumidasu Seitokai” (踏み出す生徒会)

The Student Council decides to go on a summer trip to Tokyo but because the president is convinced the lumps of metal can’t fly they take a train. Once in Tokyo they spend the night telling ghost stories and watching the sun rise.

“Student Council Reaches Out” “Sashinoberu Seitokai” (差し伸べる生徒会)

The student council is in the midst of deciding the theme for the school festival held during the fall season when Mafuyuu and Minatsu announce they will be transferring schools. Minatsu suggests fighting, Mafuyu “competition”, Chizuru pushes for “pain” and Ken pushes for “licentious”. To try to stop the sisters from transferring they suggest going with the fight theme.

つばさキャット 其ノ參 Tsubasa Cat Sono San Tsubasa Cat - Part 3

On the way to school, Koyomi finds Hachikuji in the middle of the street and assaults her in a teasing manner. Hachikuji panics and breaks his finger. Later after they calm down, Hachikuji tells Koyomi that she saw Shinobu at the donut store.