Battle Spirits: Brave(2010)

Dan is teaching young Battle Spirits fans about the cards, but he is suffering from a thirst he cannot quench. “I want fierce battles! I want to fight someone even stronger!!” And then Mai appears. She asks him to come with him to an era in which he can Battle. The new stage for Dan’s fights is the future. The Earth is being encroached on by Otherworld Mazoku monsters. He reunites with the administrator Kazan who asks him to rescue humanity from the brink of disaster.