: Kyousuke and Kirino are confronted by Manami Tamura, Kyousuke's childhood friend. Manami harshly criticizes their relationship as socially unacceptable and "disgusting". After a physical altercation between Manami and Kirino, Manami confesses her long-held love for Kyousuke, but he rejects her, choosing to stand by Kirino.
The series concludes with a scene in Akihabara where Kyousuke casually kisses Kirino on the cheek. This action is widely interpreted as Kyousuke using his "one-time wish" (won earlier in a bet) to break their promise of ending the relationship. OreImo 2 Episode 16
: As per their original agreement, they "end" their romantic relationship upon graduation to return to being "normal siblings". Kirino returns her ring to Kyousuke. The Controversial Ending : Kyousuke and Kirino are confronted by Manami
: While the anime shows them returning to "normal" status, it is heavily implied—and further detailed in the original light novels—that they continue their relationship in secret. The series concludes with a scene in Akihabara
: The finale remains divisive; while some fans find it a fitting conclusion to the "siscon" (sister complex) theme, others criticize it for being a "ridiculous compromise" that lacks full commitment.
The episode centers on the resolution of the siblings' romantic relationship, which they previously agreed would only last until their graduation.