Q:

Which of the OreImo endings followed the light novels?

The anime adaptation for Ore no Imouto ga Konnani Kawaii Wake ga Nai had two endings, which branched off after episode 11 (the "good end" vs the "true end"). Of course, these couldn't both have happened in the light novels because they aren't consistent with each other. Which one of these follows the light novels closer, i.e. in the novels,

 does Kirino go to America or stay in Japan?

I suppose there's also the possibility that these are both anime-original content.

A:

The "true end" of OreImo anime follows the novel (and quite closely at that). This short excerpt from Volume 5 Chapter 4 answers the question.

 But the mail I got from my little sister betrayed my expectations.

Please throw away my entire collection that I’ve entrusted to you.

 That was the only sentence written. 

