Whereas the first movie was very faithful to the Manga series, the plot in this part is quite different. This is not a bad thing per se, but I was a bit disappointed that Manjome and dream navigator Tagasuki were represented as 1-dimensional characters who are aware of all of friend's plans. Also, there a scene where Maniome basically says what is going to happen next that totally spoils the movie's climax. I believe a lot of people who are not familiar with the Manga series will either not fully understand what is going on or find the movie boring.
My friends and I agree that three movies are simply not enough to retell the complex story of the Manga series. A TV show would probably have been a better approach.
Overall, I still give this movie 5 stars, because it is entertaining and the few more exciting scenes are well executed.