Blankets by Craig Thompson.

I'm speechless. Read this. Read it now. It's amazing. It's a graphic
novel (definitely NOT a comic book, clocking in at almost 600 pages) that
tells the sweetest, most beautiful, most poignant story ever. It will warm
your heart and then it will break your heart. This is the perfect marriage
of plot and medium; despite the fact that it's a 600 page novel, I think the
graphic novel format tells the story far far better than a traditional novel
could.

The only possible caveat is that there is some mild sexual nudity in the
images. It is tasteful and completely appropriate and thoroughly necessary
to the plot, but it is sexual nude drawings, so there are parts that aren't
good for reading in public. So read it at home. But go read it now!