I really doubt she'll end up with Toba. It's totally going to be Akkey because of the whole fate at the train station scenario. This mangaka likes the dark hair ones too.
I hope so.
If you look closely at that cover, you'll realize that it's from the fourth volume.
On the cover of the first volume it was Akkey ( http://www.amazon.co.jp/dp/4088673093/?ref=cm_sw_r_pi_dp_8rlavb1P706VX),
The mangaka simply wanted to feature this cute moment with toba on this volume.
Here's the cover of the fifth volume too : http://img.bato.to/forums/uploads/195ec60549bb92134b49b36a67cded74.jpg
So don't worry ^^
I want it to be Toba...
Hahaha actually me too ^^ But I know that's not going to happen ...
The guy is blonde she she will probably end up with Toba.
Although I would prefer if she ends up with Akkey. I don't think she's Toba's type. Well that is just my personal thought. I will be content with any endings.