桐乃態度變好了這件事讓京介覺得怪怪的。這一天，桐乃找京介作“最後的人生諮詢”。原來是找他去買深夜開賣的色情遊戲。後來總算順利買到了，卻錯過了最後一班車。京介於是向素昧平生的陌生人借了腳踏車，從秋葉原一路騎回了家。

黑貓進了京介的高中，成了京介的學妹。不容易和人打成一片的黑貓，在班上顯得與人格格不入。京介看到這情況覺得很擔心，於是在沙織的建議下，和黑貓一同進了電玩研究社。在該社團裡，他們碰到了京介的死黨赤城的妹妹，瀨菜。而自稱社長的那個人，更是京介認識的某位人物。

電玩研究社社長三浦眼見新入社的黑貓和瀨菜彼此交惡，於是吩咐兩人要共同來製作一款遊戲。而且製作的這款遊戲，要從黑貓和瀨菜兩人提的企劃案之中，擇一採用。中二病的黑貓，和腐女瀨菜，這兩人最後會想出什麼樣的遊戲？而最後又是誰的企劃案會被採用呢？

相對於因為製作出來的遊戲在網路上遭到惡評而感到沮喪的瀨菜，黑貓反而提議說，下次要作出一款任何人都會覺得有趣的遊戲。京介溫柔的看著黑貓朝新的目標開始邁進，在這同時，京介的手機裡收到兩通簡訊。一通是來自黑貓，另外一通，竟是來自目前遠在美國的桐乃。

Recap of the first episode, with additional comments from the characters.

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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.

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Special Included with Volume 4 of Season 2

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Special Included with Volume 6 of Season 2

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