The town that developed the newest network - Den City. There, in "LINK VRAINS," the VR space managed by SOL Technology, people Duel day and night. Our hero, Fuji Yuusaku, is a cool high schooler who posses outstanding powers of observation.
He's cool because no one knows his identity.
Er ist so cool,
weil keiner weiß, wer er ist.
Lo mejor es que nadie sabe quién es.
Ele é maneiro porque ninguém
 sabe a identidade dele.