Kuroneko stops being the third wheel and becomes the actual ending, which means everything you watched in season one finally makes sense. These four episodes do what the TV series couldn't: they let the relationship breathe without pretending the answer was ever anything else. This is what the light novel readers got all along, and it hits different when you realize the show was building toward this the entire time, not away from it.

Ore no Imouto ga Konna ni Kawaii Wake ga Nai TRUE ROUTE is a four-episode ONA from 2011 that gives the TV series a different finale. The story splits off after the eleventh episode of the broadcast run. The TV version closed on a good end created for the anime, while this true end stays close to the original light novels. Expect a mix of comedy, romance and slice-of-life moments.