Copellion was truly one of those anime that was over before I knew it.
At just 13 episodes, the story smoothly progressed from an interesting introduction to a satisfying resolution, and at no point did I find myself bored; or for that matter, begging for more.
The plot was original, and creative. While the setting strongly reminded me of Pumpkin Scissors (one of my favourite series). So perhaps my enjoyment was tinged with a bit of nostalgia…
Nonetheless, it was well-paced, and well executed… and certainly deeper than what one might expect from an anime centered around 3 high school girls.