According to the official website, the fifth volume of the Blu-ray and the DVD of Onii-chan no Koto nanka Zenzen Suki Janain Dakara ne!! will include an unaired episode. It will be released on July 6th.
Genres: Comedy, Ecchi, Romance
Watch Onii-chan no Koto nanka Zenzen Suki Janain Dakara ne!! Special episode 1 online — subbed and dubbed, with automatic AniList / MyAnimeList progress sync.