桐乃态度变好了这件事让京介觉得怪怪的。这一天，桐乃找京介作“最后的人生咨询”。原来是找他去买深夜开卖的色情游戏。后来总算顺利买到了，却错过了最后一班车。京介于是向素昧平生的陌生人借了脚踏车，从秋叶原一路骑回了家。

黑猫进了京介的高中，成了京介的学妹。不容易和人打成一片的黑猫，在班上显得与人格格不入。京介看到这情况觉得很担心，于是在沙织的建议下，和黑猫一同进了电玩研究社。在该社团里，他们碰到了京介的死党赤城的妹妹，濑菜。而自称社长的那个人，更是京介认识的某位人物。

电玩研究社社长三浦眼见新入社的黑猫和濑菜彼此交恶，于是吩咐两人要共同来制作一款游戏。而且制作的这款游戏，要从黑猫和濑菜两人提的企划案之中，择一采用。中二病的黑猫，和腐女濑菜，这两人最后会想出什么样的游戏？而最后又是谁的企划案会被采用呢？

相对于因为制作出来的游戏在网路上遭到恶评而感到沮丧的濑菜，黑猫反而提议说，下次要作出一款任何人都会觉得有趣的游戏。京介温柔的看着黑猫朝新的目标开始迈进，在这同时，京介的手机里收到两通简讯。一通是来自黑猫，另外一通，竟是来自目前远在美国的桐乃。

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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