In the midst of his calm everyday life, Aichi is entrusted with the wishes and prayers to save the Planet Cray from the brink of destruction, through a mysterious dream. In that dream, Tatsunagi Takuto announces an invite-only tournament, and invites both Aichi and Kai to take part in Messiah Scramble. The first prize is the card named Messiah, the name of a saviour that was heard in a dream. And so, the curtain rises on the harshest battle ever for the team of Aichi and Kai as they have to confront Ibuki Kouji.

Source: Cardfight!! Vanguard Wiki

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Other: Cardfight!! Vanguard: Legion Mate Hen