Although I think the whole "holding her back," argument is lame, and that Bambi abandoning Ako is the absolute wrong move, I'm still on team "bring them back together." Ako might be doing alright without Yamashiro, just drifting through her semi-life with no responsibilities or worries, not having to go to school or work or anything, but Yamashiro is clearly not doing alright without Ako.
Also, the idea of rain falling through one's eyes is quite possibly the most fantastic ideas I've seen in a story in a while.