Well, I saw this around February, and got interested because I kept seeing the OP (Precious Memories) in the aniMYX segment. What's cool about that fact is the video for the OP gave it a really interesting summary of sorts, for the anime, that is.
Well, this anime is based on a visual novel (game) so that already gives you hints of it being injected with quite a bit of drama (and if you're like me, and have seen the video I was talking about, well it gets rather dramatic and heavy quite early on).
The story is basically set in three timelines. The first is when the main characters are still in highschool (me thinks, since they're talking about college and so on). Then after something MAJOR happening, skips on ahead to a few months after that event, and then a looong time after that. (Am I making sense?) Basically, the main characters' lives are all turned upside-down and the dynamics of their relationships with each other are examined, both before and after that really important EVENT. (If you want to know the whole picture, just look for the anime..or game even).
I'm really rather impressed since I think the anime conveys the hardships of such a condition/situation pretty well, and it also explores how relationships can be affected by something so traumatic. Also PTSD is explored here (Post-Traumatic Stress Disorder, I think). Which is also something that made me interested about it. To be honest I liked the flow of the story in this version, as compared to the other one, the OVA: Kimi ga Nozomu Eien ~Next Season~, because I think the latter doesn't end erm...believably.
That, and I guess I just like Mitsuki better than Haruka (who shares the name of a rather famous anime character from another entirely different series altogether...brownies for those who guess right :P).