Ayame mo Shirazu
http://n-linear.org/ayamemo/
An all-ages doujin novel game from 2010, with art by Cloba U. Linear despite the circle being called Nonlinear.
It's available 4 free, mirror link download site:
http://holyseal.net/cgi-bin/mlistview.cgi?prdcode=12372
Covers the 2nd year in high school of its protagonist, in which she starts going out with a girl.
It's "slice of life" and more grounded in reality than a lot of 2D stuff that gets called that.
