The animation staff did an amazing job at breathing life into Kei Toume's characters. I cried at the end of the first episode, hardly believing that the formative manga that helped me through my early 20's had finally reached the big screen.
I wish it hadn't.
It's just a... blasphemous mockery of everything that made the manga what it is. They failed to capture the intricacies of the characters, who felt like real people with real issues. I wouldn't even know if they hastily tried to fit the entire slow burn 113 chapters into 12 episodes, I dropped it after episode 6.
Just read the manga.