Straight up, I ruined this for myself by looking up the show on Google. It was an innocent search! I was just trying to remember some people's names and I accidentally read the ending of the manga. I CAN'T EVEN. It ruined the show for me and, from then on, everytime I watched this, I got pretty reasonably creeped out.
Therefore, I'm not going to do my usual in-depth review because I don't think I can get over the creep-factor just yet. I will say that I powered through this anime, which means it's definitely worth the watch, in my opinion. It's a beautiful story of a man who ends up raising his grandfather's illegitamite child and how he and the child, Rin, grow to form a sort of family of their own.
The animation is beautiful and it's quite different from a lot of the cookie cutter anime that's coming out nowadays (since 2010, really). It's simple with a watercolor effect with makes it a powerful backdrop for this kind of story.
If you're looking for something a bit unusual (I'd never seen an anime like this), sweet and uplifting, then I'd recommend this. I really think it's worth the watch.
Just don't google the manga ending. Seriously.