Just finished this and I absolutely loved it! I especially like how honest she is about her circumstances and the way she described her youth shows a lot of self-reflection. I was very moved when she talked about her difficulties because I think my personality is similar to hers (though I loved school and I'm not as fearful of people).
This isn't an in depth look at the anime industry the way Shirabako is (though it definitely has a lot of insight in the industry just because that's the author's main work). I would say it's more about her relationship with her mother and her journey to find a place where she belongs in the world. The place just happens to be the anime industry.
I really want to watch The Anthem of the Heart now.
@Kalessin to add, Kaiten (new publisher) currently sells DRM-free manga from Overlap and Futabasha so those should be fine. Kodansha occasionally has some Humble Bundles (all DRM-free) so perhaps they may fine with it as well.
Download book from JNC. Run Calibre. Click add book to library. Attach USB cable between PC and Kindle. Click send to device. Device > eject. Done!
Kindle to Fire android tablet:
Uhhh ... sorry. Calibre can convert to kindle format if you want to use the Kindle app instead of an EPUB reader app, but I've never done this. The EPUB apps I checked in the Kindle app store mostly had negative reviews, this is where not having the Google Play store hurts.
You can also use Calibre's built-in ebook reader to read it on the PC.