On the day of Kyosuke's high school graduation, he has a final reunion with the gaming club. 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. As the group sit in the park, Manami becomes visibly angered upon learning of the Kosaka siblings' relationship and following Kirino's provocation, they start physically fighting. After Kyosuke breaks them up, Manami begins brutally attacking their illicit relationship while citing the damage they would cause to their social reputations. Manami ultimately confesses her love for Kyosuke and pleads with him to reconsider, but he chooses Kirino and vows to defy the societal norm to be with her, causing Manami to hit him before leaving in defeat. Afterwards, Kirino laments that Kyosuke sacrificed so much for her impossible dream, to which he contently accepts. Sometime later, the Kosaka siblings arrange a pseudo-marriage at a church, where they reveal their genuine happiness for being siblings with a kiss. Kirino gives Kyosuke back the ring, ending their relationship with her request of being a couple until graduation finally fulfilled, and they go back to being normal siblings. Shortly thereafter, Kyosuke and Kirino go to Akihabara to meet a new girl Saori recruited to her online community. As they head to the meet-up, Kyosuke casually kisses Kirino on the cheek, much to her surprise, and she states he is in for some "serious life-counselling" when they get home. As Kirino runs off, Kyosuke fondly recalls the adventure with his little sister.