Upon meeting for the first time, undefeated street fighter Daimon, Masaru and renegade Digimon Agumon become friends in the most natural way possible for the knuckleheaded duo—by fighting their hearts out. The self-proclaimed ultimate team are recruited by a secret government organization called the Digimon Data Squad, or DATS, who had witnessed an unbelievable human fighting blow for blow with a Digimon. Their primary objective is investigating mysterious problems caused by Digimon entering the real world, and the world is currently in the midst of a crisis with Digimon appearing at an unprecedented rate. Embarking on various missions with DATS, Daimon and Agumon become colleagues with adolescent genius Touma Norstein and his Digimon partner Gaoman, along with the kind-hearted Yoshino Yoshi Fujeda and her Digimon partner Lalamon. As the group continues to investigate the rapid increase of Digimon in their world, a darker truth begins to surface, and it is up to Daimon, Agumon, and their friends to get to the bottom of things.

Sightings of mysterious creatures known as Hologram Ghosts have been a popular topic on social networks for the past few years. According to the rumors, several people have fallen victim to these specters. Those fortunate to survive their encounters with the paranormal beings claim that they resembled glitched holograms. Hazakura Academy middle school student Hiro Amanokawa believes these sightings are merely an urban legend. However, as the incidents start to increase in frequency, he is reminded of the day his father suddenly vanished, with strange digital watches serving as the only relics of his disappearance. Much like the other sightings, what happened to Hiro's father cannot be explained by conventional logic. One day, when a fellow student in the academy is attacked by a Hologram Ghost, Hiro and his friend Kiyoshirou Higashimitarai decide to look into the matter. Little does Hiro know that this investigation will be their first step toward discovering a dangerous world previously unknown to mankind.

The human world has been attacked by an unknown force. Using poisoned thorns, it has put all humans to sleep. Agumon, Gaomon and Lalamon are the only ones left to defeat this enemy. Guided by Rhythm, a young girl they saved, they learn that their enemy is called Argomon. But what can the three digimon do, when they can't even evolve. (Source: ANN)

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)