"Backstories missing" pretty much covers this review. Tremendous lost opportunity. Unlike some other reviews, I did like the 3D cgi and the choice of using earth tones for the colour scheme, which provided a warmth to all the scenes. In fact, it was beautiful! The musical score, although uninspiring, was adequate. The characters were probably engaging but it's hard to tell when you don't understand their motivations. In all, I did want to give a higher rating but couldn't, even though the story was good. It's just that context was missing on why the characters did what they did. Another 20 minutes would have added a lot and could have placed this in the top tier of anime. Instead, I watched a medium tier effort that barely made an average grade. Sigh! I am honestly saddened as this could very easily, with very little effort, been so much better. :-(