We Are (Sorta) Friends is a cancelled film that was intended to be released in either 2005 or 2006.
It would've centered on Yukari and Nyamo, with the former driving the latter to her breaking point, making them question their friendship. We'd also get to learn more about their past and see Yukari determining if she went about her playful teasing the wrong way.
Reason for Cancellation/Availability Edit
The film was never authorized by those involved with the original anime. Additionally, had the film been produced, it would've been released 3-4 years after the original property ended, thus making into a money-sink.
After a leak of most of the finished animation made it onto the internet, the project gained a following from the Azumanga Daioh fanbase. All that exists regarding the film is some raw animation, a finished script, promotional posters and a trailer.