When you get a story as good as this one, your satisfied every time to watch/read it. The manga for Kotonoha no Niwa certainly delivers in terms of enjoyment. That said, I don’t feel like this is something you should read unless you’ve already watched the film, and should be seen as more a compliment to the film. If you liked the film, you should absolutely read this though, it adds a few more details about a few more things, and still hits where it needs to. While I don’t feel the manga is as strong as the film is, the underlying story is still absolutely fantastic. If you haven’t seen the film, I would highly, highly recommend it, and then, if you liked that, you should check this out as well, it’s short and adds on to what the film had set up, and with that, I give it a:
10 out of 10.