The mysterious challenger Katsuki defeats Megumi and challenges Danji to a match, but Danji has a condition: to defeat Yu-yu first. And that's how Yu-yu started his special training with Danji for the cardfight one week later...
So then... 
...إذًا
Was sagst du?
Por eso…
Por eso…
Alors ?
Então...
Так что?