if anime = an original work

I would like to have a list of animes that are original works. So they are not adaption of any other type of storytelling. That's the main criteria.

There are plenty of anime based on manga, but that's not always very good approach. Some animes are only half made, changed too much or have too many fillers in it. I believe anime is ( or should be ) at its best when it's an original work. At least you could assume that when you know the concept, you can write a story that is more solid and better fit.

So if you know an anime that is

a) an original work
b) clearly a completed piece of work
c) has a solid story

and, ( should go without saying )

d) a damn good one

please, share your knowledge here!