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...
Sure, why not? However many fights you need. 
.بالطّبع، لم لا؟ أيّا كان عدد المعارك الّتي تحتاجينها
Ist doch okay. Ihr könnt,
so oft ihr wollt, Fights austragen.
No hay problema.
Combatan las veces que quieran.
No hay problema.
Combatid cuantas veces queráis.
C’est une bonne idée, non ?
Tu pourrais t’entraîner.
Parece uma boa, não acha?
Lute o quanto precisar.
Я не против. Можете играть
сколько хотите.