This movie has no story, it's just a concert with the 3 main groups. So what's the point in watching ? The musics and characters. First the musics, they are all really catchy and high quality. In my opinion they are among the best of Utapri songs. Then the characters. Have you seen the Utapri lives and the parts when the seiyuu talk with each others ? In the movie, they have little talks in a similar way, it's very funny and heartwarming. The way they act is also faithful to their character. In summary, this is an animated Utapri concert, with about equal time spent on the3 groups, amazing music, no scenario, great character interactions and a good cgi. But it is also very entertaining.
If you're an Utapri fan go immediatly watch it, it's a must see. If you're not but you're interessed in anime with music why not give it a watch.

For me it's a movie that I love watching and I would rate it guilty pleasure/10
(sorry for my english, it's not my first language)