Just finished this. I was consistently impressed with the writing from start to finish.
While there were two predictable events in the plot that I didn't like because they actually did happen, I liked the story over-all. The biggest draw-in for this game for me would be the characters' dialogs and Tomohiro's narration; sometimes philosophical, sometimes pessimistic and consistently grounded on reality. It just serves to make the three main characters that much more interesting. There were conversations between Matsuri and Tomohiro that felt cruel and funny at the same time.
The basic plot was surprisingly simple in contrast to Tomohiro's complex thoughts.
It's basically about love, farewells, friendship and growing up. Standard soap opera stuff... at least in Philippine Telenovelas
The game is really all about the characters and getting the reader immersed in their particular circumstances and it does a fine job of doing that.
The ero scenes were well-integrated into the story, although, I felt that the descriptions seemed a bit too clinical rather than sensual at times. Also, the prologue after the epilogue to signal a new beginning just doesn't seem to have the impact that it's probably meant to have. (Or it could be that I just didn't particularly care for Hikari's POV.) Also, the ending itself felt like it was missing something.
Over-all, this is a very well-written and localized VN that even made me shed an emo tear near the end of chapter 4.