Prism by Higashiyama Shou — Cancelled

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Riding high on the memory of a boy named Hikaru with whom she spent a day during her last year of grade school, Megu went through middle school without romance. Now that she's a high school student, she has decided she is finally completely over her first love and can look towards the future. Megu meets a pretty girl on her first day of high school who gives her a big hug, and her name is Hikaru!? - Mangaupdates

Volume 1
Chapter 1 released Jul 1 '11
Chapter 2 released Sep 2 '11
Chapter 3 released Oct 19 '11
Chapter 3.5 released Oct 26 '11
Chapter 4 released Nov 25 '11
Extra 1 released Oct 26 '11
Extra 2 released Apr 16 '12
Volume 2
Chapter 5 released Jan 6 '12
Chapter 6 released Feb 16 '12 NSFW
Chapter 6.5 released Apr 16 '12