Takanashi Rikka Kai: Gekijouban Chuunibyou demo koi ga shitai!

This movie (or OVA) added so much to the series, it basically is a retelling of season one,. but from Rikka's perspective, which i think is pretty awesome and interesting. And I was right, this movie was absolutely fantastic. The characters the personality, pacing, plot and so on and so forth. Everything you loved from season 1 is back in action, with some awesome twists and tricks to keep the viewer engaged. I definitely recommend you watch this ova after season 1!