Since the final battle against Garde (Fua Duelist), Shobu Kirifuda and his friends were having a peaceful everyday life, filled with nothing but fun duels. But things did not last as the After-R member, Xanadu, who was revealed to be the subordinate of "Adam"; have started going against the rest of the Garde--annihilating all of the remaining members, abducted Zakira, and leaving Ash to escape and desperately asks for Shobu's help. As Shobu and his friends faced many hurdles in order to save Zakira, the truth begins to unfold as Adam, the first-ever Duelist in the world, is finally resurrecting from his long slumber.

(Source: Duel Masters wikia)