We Were There 1 by Yuki Obata, 2008 (originally published in 2002). Published by Viz Media (Shojo Beat).
Nanami Takahashi falls for Motoharu Yano, the most popular, carefree boy in class. For Nanami, it's first love, but Yano is still grieving the death of his girlfriend who died the year before.Nanami starts high school with high hopes of making lots of friends. She develops a crush on the enigmatic Yano, but he may have too many secrets for her to handle.
Why: Okay, so I have read volumes 3 and 6 of We Were There and would like nothing better than to start this series from the beginning. You will so understand why if you read my review of volume 6 (found HERE).