Ore no Imouto ga Konnani Kawaii Wake ga Nai. Specials

Synopsis

After Kyousuke's confession, Kirino tells Kyousuke that they can't actually get married because they are blood-related siblings. Kyousuke, then reminds her about how Kirino still said that she loves him. The next morning Kirino announces the relationship to Kuroneko and Saori at the Cure Maid Cafe and that's where Kyousuke get's a text from Kanako telling him to come to UOX by himself. This is of course a trap where Kanako conffesed to him on stage but Kyousuke replies that he already has someone he loves a lot. The day after Kyousuke and Kirino have a "ceremony" where they put their items in each over's room.

(Source: Oreimo Wiki)