Original "chibi" styled animations of Imouto sae Ireba Ii. posted on the anime's official Twitter channel. Also included on the BD/DVD releases.
Up to EP 11Bunny DropAnime
Up to EP 26A Certain Magical Index IIIAnime
Up to EP 10Operation Han-Gyaku-Sei Million ArthurAnime
Up to EP 11A-Channel: +A-ChannelAnime
Up to EP 1Tiger & Bunny Movie 1: The BeginningAnime
Up to EP 12Denki-gaiAnime
Up to EP 1Selector Destructed WIXOSS MovieAnime
Up to EP 1Tales from EarthseaAnime
Up to EP 6Dies Irae: To the Ring ReincarnationAnime
Up to EP 26Negima!? Magister Negi MagiAnime
Up to EP 12RobiHachiAnime
Up to EP 1Hipira-kun SpecialAnime