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...
Isn't that what friends are for? 
أليس هذا ما يفعله الأصدقاء لبعض؟
Dafür sind Kameraden doch da.
Para eso son compañeros, ¿no?
Para eso sois compañeros, ¿no?
Les amis sont aussi là pour ça.
Não é pra isso que são os amigos?
Для этого нужны друзья.