Fourth Break Blade Movie.

My Melody arrives on Earth much to the surprise of her rival Kuromi. Together with one of the junior high school students, Yumeno Uta, they decide to protect the dreams of the people with the help of magic.

Yuka, Rinko, Saki, and Natsumi are childhood friends and classmates nearing the end of their second year of middle school and eagerly awaiting their summer break. Unfortunately, it's a bittersweet time for this close-knit group, as Saki is transferring to another school. The girls are determined to keep the spirit of their friendship alive, even if only for this summer. They reminisce about a large stone the four of them used to visit, tucked away in an old Shinto shrine, and the belief that if four friends gathered around it and made a single wish, it would come true. Now, much to their surprise, they discover that old folktale is true. Natsu-iro Kiseki follows the magical events the girls go through during this last summer they’ll all spend together. As friendships get tested, and fantasies are fulfilled, the four classmates will end up learning a great deal about themselves and each other on the path to forging a summer that they’ll never forget.

After the events of 02, everything is finally getting back to normal. That is, until a strangely familiar icon starts showing up on computer systems around the Japan. And not just computer systems... TVs, mobile phones, video games; anything with a screen with online capabilities. And this icon seems to be looking for somone... Yagami Taichi, and Ishida Yamato, who defeated it several years before. Yes, it turns out that this jellyfish digimon is in fact Diablomon, the Virus-type Digimon that was defeated in the second movie. But this time, he's learned to make himself physical, and is sending thousands of copies of himself into the real world.

Koushiro and Ken devise a plan to rid the world of the virus once and for all, but it'll take the help of all the Destined, past and present. Once again, it's a race against time to put a stop to Diablomon's plot... but even that is cloaked in shadow.

Will the revival of Omagamon be enough to stop Diablomon a second time, or will the millions of copies prove enough of a power boost to shrug off the "Digimon Champion of Justice"? Of course, he hasn't seen the new breed of Chosen, nor the new techniques. It's a fight to the finish, with the destruction of Tokyo resting on the line. 

(Source: AniDB)