The Hanoi Project (ハノイプロジェクト, Hanoi Purojekuto), also known as the Lost Incident (ロストけん, Rosuto Jiken), is an event that occurred 10 years prior to the start of the Yu-Gi-Oh! VRAINS anime.[1] Kiyoshi Kogami, a researcher at SOL Technologies, developed and executed the incident without the knowledge of his company.[2] This project resulted in the creation of the Ignis.[3]


10 years before the present, Dr. Kogami believed humanity would eventually become extinct since human life always ended in death or due to phenomenons. He sought to create humanity's successor---AI with free will. Together with Kyoko Taki, Aso and Dr. Genome, Dr. Kogami planned and executed the Hanoi Project, kidnapping six children one-by-one. During their six months of captivity, the children were imprisoned separately in rooms with nothing but VR equipment. Believing that Duels were the best way for AI to understand humans, Kogami forced the six children to Duel in a virtual arena where if they did not win, they were electrocuted and starved. Behind the scenes, the scientists used the Duel data to create the Ignis, who were modeled after the six children and the Duel Monsters' Attributes. After the children were rescued, the incident was covered up.

In the aftermath of the incident, several of the children suffered from post-traumatic stress disorder, with some taking years of therapy to recover while others have not recovered at all. During the final showdown between Playmake] and Varis, the latter revealed he was the one who reached out to Yusaku. He couldn't stand hearing the pain of the six children so he called the police. Once the incident came to light, Dr. Kogami was imprisoned by SOL Technologies and was able to complete the Ignis before the company infected him with a computer virus to cover up the incident. Furthermore, Dr. Kogami tests several simulations of the Ignis growth and eventually concludes that their continuous development would cause them to supervise and eventually destroy humanity, forming the Knights of Hanoi with his assistants to kill his own creation.

The project's name is the main reason why Yusaku and Kolter suspect the Knights of Hanoi of a major involvement in the incident and thus why they pursue them. Varis confirmed his knowledge of the incident during his Duel with Yusaku,[4] while Dr. Kogami, Kyoko Taki and Aso were all present during the incident, watching the victims' suffering.[3]

10 years later, some of the victims were reunited with their Ignis. Yusaku and Takeru work with their Ignis to support co-existence between human and Ignis, Jin is currently being controlled by his Ignis Lightning and serves as his puppet, Miyu is currently comatose after being infected with a computer virus by Lightning, and Windy caused his partner to be involved in a reckless driving accident.

People Involved



The victims of the Lost Incident each have a special connection to the Ignis they're associated with, as seen with Yusaku and Ai's Link Sense and when Spectre was able to detect that his Ignis Earth got terminated.

Victim Effect Status Ignis Attribute Age by the time of abduction
Yusaku Fujiki Post-traumatic stress disorder, grew a strong desire for revenge, 'time stopped moving' for him, his heart was closed off. Active Ai DARK 6
Jin Kusanagi Heavy post-traumatic stress disorder, 'closed his heart' from the world. Currently being controlled by his Ignis. Active Lightning LIGHT Unknown
Specter Started enjoying life, 'time started moving' for him, grew to distrust humanity. Active Earth
EARTH Unknown
Takeru Homura Became socially reclusive, suffered severe trauma towards the card "Despair from the Dark", 'time stopped moving' for him due to his parents' death. Active Flame FIRE 6
Miyu Endured the project through her strong resolve to see Skye again. Currently in a comatose state because of Lightning infecting her with a computer virus. Inactive Aqua WATER Unknown
Unknown Involved in a car crash instigated by Windy. Unknown Windy WIND Unknown



  1. Yu-Gi-Oh! VRAINS episode 19: "The Lost Incident"
  2. Yu-Gi-Oh! VRAINS episode 20: "A Piece of the Puzzle"
  3. 3.0 3.1 Yu-Gi-Oh! VRAINS episode 28: "Final Commander of the Three Knights"
  4. Yu-Gi-Oh! VRAINS episode 12: "Link the Circuit"