Después de chocar con su hermana pequeña, Kyosuke encuentra un DVD de anime que contiene un juego para adultos. Kyosuke pronto descubre que el juego le pertenece a Kirino y le pide explicaciones al respecto.

Al darse cuenta de que Kirino no tiene nadie con quien compartir sus pasatiempos, Kyosuke le pide consejo a su amiga de la infancia, Manami Tamura, quien le sugiere que intente que su hermana haga algunos amigos otaku por Internet.

Kirino empieza a salir con sus nuevas amigas otaku y se sorprende al descubrir que no tienen que preocuparse por ocultar sus pasatiempos.

Kirino obliga a Kyosuke a jugar un juego eroge. Este, desconcertado, le pide ayuda a las nuevas amigas otaku.

On the way home from an enjoyable Summerket. They bump into Aragaki Ayase, Kirino's best friend.

Kyousuke is asked about his relationship with Manami by his friend, Akagi. Akagi is exasperated when Kyousuke answers that, although they don't have a romantic relationship, he doesn't want her to be taken by anyone else.

Kirino has made her debut as an author. Reader response has been overwhelming, and her editor has even better news to report.

Kirino has been acting strangely antsy for the past few days. The reason is that the little sister game she ordered hasn't arrived yet.

One day, Ayase calls Kyousuke out of the blue and asks him to see her. She wants to get Kirino a present, and wants him to think of what she would be happiest to get.

Sent out to buy groceries by his mother, Kyousuke bumps into Manami at the supermarket. They get to talking, and they eventually arrange for Manami to come visit for the first time in ages.

Ever since the events of the previous episode, Kyousuke has been nervous about his improved relationship with his sister.