Duel Masters Victory

Duel Masters Victory is the 7th season of the Duel Masters anime series.
It introduces a new protagonist named Katta Kirifuda, the brother of Shobu. He wants to be a dueling champion like his brother Shobu, but in his own way. The series shows the beginning of his dueling adventures with his friends, Bucchake, Yohdel and Benchan. During these adventures he considers Dragon Ryu a fierce duelist as his rival.
This series also features the story behind the battle between the races of Hunters and Aliens.

(Source: Duel Masters Wiki)