Final thoughts on the series in general:
Great slice-of-life high school romance. I'm kind of in love with the heroine of this series. Haruna is practical, level-headed, and ultimately kind of cool (as in, like, chilly), but not in an obnoxious tsundere way or anything. Refreshing after a lifetime spent reading shoujo romances with whiny, overdramatic heroines. It's also refreshing to read a shoujo romance where the couple starts out together and their relationship grows. I guess that's become more popular in the last decade (thinking of 'Say I Love You' and 'Kimi ni Todoke') but man, back in the 90s you had to be in it for the long haul.
I haven't read many other reviews, but I'm willing to bet that Atsuyuki is a polarizing character. I think he's fantastic and definitely added to the story. It seemed like his feelings for Haruna did become more genuine, but I think she ultimately had him pegged: it's Macharu he really loves (agape [well, philia], not eros, as their homeroom teacher would point out). I love that kind of dynamic in a love triangle.