Yuusaku manages to capture the the Mysterious Lifeform as he pursues the hacker group "the Knights of Hanoi." To defeat the Knights, he logs in to the VR space "LINK VRAINS" as "Playmaker" and challenges them to a Duel with the Mysterious Lifeform as a hostage.
It seems he knows about Speed Duels.
Der Kerl scheint zu wissen,
was ein Speed-Duell ist.
Parece que él también conoce
los Duelos de velocidad.
Parece que ele sabe 
sobre Duelos Relâmpago.