The Digital World (デジタルワールド Dejitaru Wārudo?) of Digimon Story: Cyber Sleuth is ruled by Yggdrasill. It also has its own calendar, and at the time of the Ueno Digimon Festival its year is ◎x◎.
During Cyberspace EDEN's beta test, Aiba, Nokia, Arata, Yuuko and Yūgo enter the Digital World through a gate, and meet Agumon, Gabumon, Kuramon, Botamon, and a Pabumon. During the visit, they are attacked by Eaters, who absorb Yūgo's mind data, causing the boy to contract the EDEN Syndrome.
Eight years later, Aiba learns the Digital World has been damaged by the Eaters. Aiba and his friends return to the Digital World to defeat Mother Eater, after which the Digital World is restored.
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