Timeline
April 25, 1985:
Naoko Magami is born
August 1988:
Failure of Project Mobius
11 years before Digimon Adventure
August 1, 1988:
Setsuko Magami is born in the Digital World
August 1995:
Events of Digimon Adventure Movie 1
4 years before Digimon Adventure
The original 5 Chosen Children are sent to the Digital World
August 1999:
Events of Digimon Adventure
The original 5 Chosen Children return to the Digital World and work behind the scenes with Gennai
August 1, 2019:
The Great Shaking
20 years after Adventure
September 2048-June 2058:
The Infinity Cyberinvestigation Agency is formed and spends the next 10 years investigating the Great Shaking.
June 2058-December 2064:
Project Mobius Two
ITI begins a worldwide search for the current Chosen Children under Mataymon’s guidance.
June 2058:
Tian Shu’s evacuation from China, death of Tao-rin Shu
Tian Shu – Age 5
April 2060:
Takashi Mitsuishi and Kyoko Nogami divorce.
July 2064:
Jun Aikawa and Mana Saitou’s discovery and observation by ITI, Kadena Air Base, Okinawa
Jun Aikawa and Mana Saitou – Age 8
August 2064:
Seita and Yuka Kazama’s attempted kidnapping by ITI
Seita Kazama – Age 11, Yuka Kazama – Age 3
November 2064:
Kei Nogami’s kidnapping by ITI
Kei Nogami – Age 3
December 2064:
Rion Araneta’s home invasion by Touma Nogami
Rion Araneta – Age 5
December 2068:
Akira Mitsuishi and Rion Araneta are transported to the Digital World
Akira Mitsuishi – Age 15, Rion Araneta – Age 9
December 24, 2068:
The D.C. Bomb
Akira Mitsuishi and Rion Araneta return to the Real World
June 2069:
Akira Mitsuishi returns to Japan
July-August 2069:
Events of Digimon Infinity
70 years after Digimon Adventure
50 years after the Great Shaking
Notes
Project Mobius
A secret project started in the summer of 1988, using realizer technology to open the gateway to the Digital World and bring a digital life-form to the Real World. The initial test brought back not a simple digital life-form, but a virus that set itself on infecting and destroying everything around it. The resulting destruction caused an explosion and the disappearance of the two project leaders (Naoko Magami's parents), who followed the viral life-form back to the Digital World.
The Great Shaking
A worldwide catastrophic digital and environmental incident that occurred on August 1, 2019, approximately 20 years after the events of Digimon Adventure. It included massive earthquakes, tsunamis, and hurricanes in various places.
The world economy eventually pulled through, but technological advancement stalled, leaving most of the world at the same technological level 50 years later with the exception of medical institutions and government projects. The damage to the worldwide computer networks was so extensive that the old control/admin program, Gennai, was destroyed, and the backup program, Naoko.exe (Naoko Magami’s 14-year-old persona) had to be activated. Naoko.exe still manages the systems in the present day, without knowing fully why Gennai disappeared and she became admin, or why the systems were so critically damaged. She lost contact with her human self immediately after she was programmed and sealed, so she has no knowledge or memory of the Great Shaking except for vague news reports, etc.
Naoko.exe doesn’t know the full story of the Great Shaking, and why everything happened the way it did. She only knows (via vague, secondhand reports, salvaged data, and her own interpretations) that somehow, part of Apocalymon’s data survived to wreak havoc in some unknown form, and somehow, her human self and the other 4 original Chosen Children did something about it, and it was a success. But something else went so horribly wrong at the same time that it devastated both the Digital and Real Worlds and caused Gennai to be destroyed, and forced her to awaken as backup.
Origins of the Great Shaking
To understand how the Great Shaking happened is to understand how the Crest of Spirit functions.
The Crest of Spirit has power equal to all other Crests combined. It can act like either the Crest of Light or the Crest of Darkness, depending on the temperament of the user and the user’s associations. If the user spends too much time alone or with someone associated with darkness, and becomes excessively angry in a battle, the Crest of Spirit can channel the power of Darkness. If the Crest’s power increases enough, a Digital or Global Hazard is unlocked, depending on where the user and Digimon is.
A Digital Hazard is an extreme disaster that threatens the very existence of the Digital World. Digimon that can trigger a Digital Hazard carry the “danger” symbol, and can be either visible (Guilmon) or hidden in their code (Kodamon, Coronamon, and Lunamon).
A Global Hazard is a disaster of apocalyptic means in the Real World. Digimon that can trigger a Global Hazard carry a Biohazard symbol (visible or hidden in their code, like in a Digital Hazard).
The original holder of the Crest of Spirit was Naoko Magami, and by the time her little sister, Setsuko, was born, the power was split between them since both of them were a match. Naoko got the “light” half (Coronamon’s powers resembling the sun) and Setsuko got the “dark” half (Lunamon’s powers resembling the moon). Because of this, a Digital or Global Hazard was sure to occur with Setsuko and Lunamon.
The Great Shaking resulted from the Digital and Global Hazards caused by Setsuko and Lunamon channeling the power of darkness through the Crest of Spirit during the original Chosen Children's battle with a mutated Apocalymon in 2019.
Project Mobius Two
A worldwide search conducted by ITI between 2058 and 2064, in order to find the present-day Chosen Children. The search was Mataymon’s idea, to find the children and eliminate them before they would arrive in the Digital World and receive their Digivices and Crests. Seven out of the eight Chosen Children would be found during this time, excluding Akira, who would not be found until the day she and Rion arrived in the Digital World in December 2068.
Akira and Rion’s First Trip to the Digital World
Akira and Rion’s arrival in the Digital World one year prior to the start of the story was a mostly unplanned anomaly. At the time, Naoko.exe was working on recreating the Digivices and Crests to match the 7 Chosen Children already discovered during Project Mobius Two. Akira had not yet been discovered as a Chosen Child, so a Copy Digivice wasn’t made for her. The situation was complicated even more when Nami gave Akira her old Digivice and the damaged Crest of Spirit, hidden in Akira’s luggage when she went to America to live with her mother’s family.
Kodamon and Guilmon were not born naturally in the Digital World - they were created. Rion drew pictures of them and accidentally did it on the back of Ryou’s biology report on DNA. Akira scanned the ruined pages into the computer and copied them out on clean paper. The computer also scanned Kodamon and Guilmon’s pictures, with the DNA components on the opposite sides, and compiled them into Digimon. Because of the DNA components and the nature of Akira and Rion’s Crest qualities, both Digimon were created with destruction hidden in their codes – Digital Hazard (Guilmon) and Global/Digital Hazard (Kodamon).
Ultimately, the creation of Kodamon and Guilmon was the trigger that led to Akira and Rion to be transported to the Digital World, months ahead of schedule. Naoko.exe realized the Chosen Digimon were starting to appear, prompting her to speed up the recreation of the Digivices and Crests. In the end, only 1 Digivice and Crest were ready – Rion’s. Paired with the Digivice and Crest given to Akira by Nami, it was enough to transport the two to the Digital World.