Setting
In the events prior to the series, ten Digimon creatures from the "Digital World", a parallel universe originated from Earth's various communication networks, sacrificed themselves to seal Lucemon. These Digimon, collectively known as the "Ten Legendary Warriors", created artifacts from their data: the twenty "Spirits" (ten Human and Beast Spirits for the elements of fire, light, wind, ice, thunder, earth, wood, water, metal and darkness), before leaving the Digital World in the care of three Celestial Digimon, Ophanimon, Cherubimon and Seraphimon. When Cherubimon betrays them, Ophanimon summons six children from the human world into the Digital World to become the "DigiDestined".
Plot
Takuya, Koji, Zoe, J.P., and Tommy are among several children who receive a text message inviting them to board a train at Shibuya Station. The train brings them to the Digital World. While exploring, the five gain the ability of Spirit Evolution, where they are able to transform into ancient Digimon warriors and meet two guided Digimon named Bokomon and his dim witted sidekick, Neemon. In addition, their cell phones have turned into a type of Digivice (digital device) known as a D-Tector, which they can also purify defeated Digimon by scanning them.
While exploring, the Legendary Warriors learn from Seraphimon that he, Ophanimon, and Cherubimon once maintained order among the human and beast-type Digimon, until Cherubimon became corrupted and urged the rest of the beast-type Digimon to engage with the human-type Digimon in a war. During this time, the Legendary Warriors are forced to fight five other ancient Digimon warriors, one of which Koji learns is his estranged twin brother, Koichi, who was corrupted into Duskmon. Koji manages to purify Koichi, allowing him to join them on their quest to defeat Cherubimon. They rescue Ophanimon while Cherubimon attacks them, but she sacrifices herself to save them and upgrades Takuya and Koji's D-Tectors with the last of her strength to allow them the ability of Unity Spirit Evolution.
After defeating Cherubimon, the DigiDestined learn that Lucemon is sealed within the Digital World's core, and a guide named Baronmon, warns the six Digidestined that the prophecy is that Lucemon will be revived. Two Royal Knights, Dynasmon and Crusadermon, are summoned by Lucemon, and steal all of the world's data to awaken him. The kids attempt to stop the evil knights from scanning the entire digital world, but they fail as they finally free Lucemon. After Takuya and Koji defeat the knights, Lucemon kills them for their failure and absorbs their data to Digivolve into his Chaos Mode. Koichi is revealed to be a digital shade - his physical body is unconscious in the real world after a dangerous fall. Lucemon destroys Koichi's digital form and absorbs his data, which enrages Takuya and allows all the spirits to combine into the ultimate Legendary Warrior Digimon Susanoomon. Though initially defeated, Lucemon Digivolves into his Shadowlord Mode, and arrives in the real world. After reviving Ophanimon, Cherubimon and Seraphimon, Susanoomon successfully destroys Lucemon, restoring the data and the Digital World. The children return to the real world and realize that an hour has not passed since their original departure, and save Koichi by using the power of their D-Tectors, which then revert into cell phones. Takuya and his friends then embrace their future.
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