This is a recap, if you're looking for new material or scenes you will be sorely disappointed. There's less than 10 minutes of new footage in this 1hour 20 minutes long movie.
There's no story to be told here, they find a mysterious box that they use as a plot device to start the clipshow.
The new scenes aren't fun to look at, they include real photographs as backgrounds, still pictures, and some chibi art.
I hope you liked the mmd+character songs in the series because not only you have to sit through them again, there are new ones.
Overall, I was bored all the way through since I've
already seen everything back when the series aired. The scenes aren't expanded redone or redrawn, they just added a new voice track, with the characters discussing what's going on.
I can only imagine this movie as a brief summary for those who would willingly skip the first season before starting the second one. If it ever gets made.