Wow...I can't say how much I love this manga. At first, I read it because I saw a preview of it in a shoujo beat preview book which they used to have...but anyways, I didn't particularly love the art or the story when I read the first chapter, but I'm sure glad I decided to continue it. It started out really light-hearted and cute, and I instantly loved the characters--Nanami, Yano, and Takeuchi. They were all very loveable in their own ways. And I kept reading, because everything about the story/characters seemed very realistic to me, even though at times the plot went by really slow that it killed me. But it's a slice-of-life, and things do/can progress slowly in real life, and I think that's what makes me love this manga so much. There were also many beautifully drawn/written scenes that tugged at my emotions. The mangaka is very skillful at that...sometimes I would cry just because the scene was so simply drawn, yet it was so calm and beautiful, and even if there were only words, the words meant a lot. Like UsoSora said, it makes me feel serene. I don't know how to describe all the feelings I've felt reading this manga, but I definitely cried a lot, and it did hurt to read it at times. Also, this manga does make me think a lot, like the last few pages of the last chapter. Because the manga started when they were 15 and ended when they were 25, it made me think how much times passes.
Well all in all, this is also one of my favorite manga because it had so much depth and so much emotions in it that made it realistic and relatable. By the way, the ending was beautifully written, and I definitely recommend it to those who enjoy stories that are realistic and not some cliched and cheesy story with no depth.