[Goggen]

I'm beginning to lean towards Akazawa being the Another now.

Spoiler for speculation:

Her dream at the beginning, coupled with earlier indications that she has previously met Kouichi and that Kouichi has been in Yomiyama before but had that memory erased... It's a pretty strong hint if you ask me. It would seem they did meet, and then she died some time after that (either because she was in class 9-3 at the time, or because her "stupid brother!" was), then she came back as the Another with both hers and Kouichis relevant memories erased...

And if she's not the Another, that would mean there is some other significant backstory to be told regarding her, Kouichi and - apparently - her brother. They wouldn't bring that up at this point and not follow up on it, would they? And there is only two episodes left...