My initial impressions were off by a long shot; don’t be fooled by the K-ON! style character designs, this series has a solid story that wants to be told.
It effectively utilizes each of the 12 episodes in moving the plot forward while unraveling the persona of each character along the way. While they may display a carefree attitude, their past contains memories of the previous war and the tragedies associated with it. Just like a real person, no character only has one side.
I love how the anime begins with a cheerful and carefree atmosphere, situated in a peaceful town seemingly unaffected by the previous war. Then as the series progresses, things start to become more serious as the peace talks grind to a halt and everything builds up to the climax. It is at that moment you appreciate all the intricacies and details revealed to us before. Afterwords, it ends abruptly and leaves us wanting more, even though the conclusion was perfectly fine.
After finishing Sora no Woto, I must say that it deserves an improved rating on my part.