Saikyou Ginga Ultimate Zero: Battle Spirits

Across a colorful galaxy, Battle Spirits cards have scattered among countless worlds, and adventurous Card Questers race to find the strongest of them. Rei is an extravagant wanderer who proudly calls himself the Number One Star, traveling with the little dragon Mugen and the talking robot Salt while challenging anyone who catches his interest.

After meeting the siblings Raira and Rikuto April, Rei gains a lead on the legendary Ultimate Battle Spirits. Their search soon attracts the Guild, whose members want the same power for themselves. What starts as a flamboyant treasure hunt grows into a conflict that tests Rei's claim to be number one and reveals that the fate of the galaxy may be tied to the cards they are chasing.