Mede Shireru Yoru No Junjou
Complete | suzuki ami,Itsuki Kaname | 2007 released
This actually made me cry like three times at three in the morning. Definitely worth reading, beautiful plot, art, interesting characters and good relationship building and tension. I only wish that the ending was a bit more stretched out and picked apart but overall this manga is beautiful.
Kusuriyubi ga Shitteru