The Hanoi Project (ハノイプロジェクト Hanoi Purojekuto), also known as the Lost Incident (ロスト
10 years before the present, six children were kidnapped by a certain organization and went missing one-by-one. During those six months of captivity, the children were imprisoned separately in rooms with nothing but a VR equipment. They were forced to Duel in a virtual arena where if they did not win, they were electrocuted and starved. 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. As the person to whom the mysterious voice belonged to was not amongst the rescued, Yusaku believes they may still be captured.
The project's name is the main reason why Yusaku and Shoichi Kusanagi 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, while Kiyoshi, Kyoko Taki, and Faust were all present during the incident, watching the victims' suffering.
|Victim||Effect||Objective||Status||Ignis||Age by the time of abduction|
|Yusaku Fujiki||Post-traumatic stress disorder, strong desire for revenge||Revenge against Hanoi||Active||Ai|
|Jin Kusanagi||Heavy post-traumatic stress disorder||Inactive||Unknown|
|Spectre||Started enjoying life, 'time started moving' for him||Serve Varis||Inactive||Unknown|
|Two unnamed children||Unknown||Unknown||Unknown||Unknown||Unknown|
- ↑ Yu-Gi-Oh! VRAINS episode 19: "The Incident Buried in the Darkness"
- ↑ Yu-Gi-Oh! VRAINS episode 20: "Unyielding Justice"
- ↑ 3.0 3.1 Yu-Gi-Oh! VRAINS episode 28: "Final Commander of the Three Knights"
- ↑ Yu-Gi-Oh! VRAINS episode 12: "Impregnable Defending Dragon Firewall"