Continuation of the Digimon Xros Wars series featuring Taiki Kudou in a new world with new supporting characters. The plot revolves around a secret hidden in the gap between the real and digital worlds, with Tagiru Akashi holding the key to the story.

Returning to the Digital World, Taiki and Shoutmon learn that the Bagra Army has taken it over and reformatted the world to have Seven Kingdoms, each ruled by a general. 
(Source: AniDB)

Seven kids are transported to the Digital World, a strange place where digital creatures called "Digimon" reside. A group of Digimon soon befriend them and keep the kids out of harm's way. The children then discover they are the Chosen Children, which protect the Digital World from evil Digimon like Devimon and Vamdemon.

A few years after the adventures of the Chosen Children in the Digital World, a new batch of Chosen Children are summoned to save the Digital World. An evil ruler known as the Digimon Kaiser, or Digimon Emperor, is forcing the Digital World's Digimon into enslavement. The new group of Chosen Children, with the help of their Digimon, then begin a journey to stop the evil Digimon Emperor.

Takato Matsuda, Ruki Matsuno, and Lee Jenrya are children who have, by fate, received real Digimon, unlike the imaginary ones in the card game they play. Each of the children, or "Digimon Tamers", have their different views on how Digimon should be treated. But when other Digimon begin to appear around Japan, they must put aside their differences to fend off the digital intruders; even though Yamaki, who is the head of a secret organization called Hypnos is trying to eliminate all of the Digimon himself.
 
(Source: Anime News Network)

Masaru, a second year Junior High student and undefeated street-fighter, is about to learn the meaning of the word "teamwork." After Agumon escapes DATS, an organization that deals with Digimon, it winds up in a fight with Masaru. Soon Yoshino and Lalamon come to capture Agumon, and the two fighters escape. After an evil Digimon appears, it's up to Masaru and Agumon to defeat it with their DNA Charge. 
Soon, Masaru must join DATS to put an end to the Digimon coming to Earth. With the help of Yoshino, Ikuto, and Touma, the group must stop any evil Digimon that appear, and return them to the Digital World. 
But not everything goes as planned...

Takuya Kanbara is an average city kid who receives a text message from an unknown source instructing him to "board a train towards his destiny". Taking up the Call to Adventure, he finds the train in question and is whisked off to the Digital World, which is currently under threat from the malevolent Cherubimon. Cherubimon and his minions are consuming the very building blocks of the Digital World (its "Fractal Code") to increase their own power, and if nothing is done then the entire Digital World will be devoured. 

All is not lost, however. Takuya and the other "chosen" children who boarded the train inherit the power of the Ten Legendary Warriors that saved the Digital World in the distant past, allowing them to transform themselves into Digimon. With their new powers, they fight to take back the stolen Fractal Code and restore the fractured Digital World to its former glory. 

(Source: TV Tropes)

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