Cardfight!! Vanguard: Season 4, Episode 12

4 - 12: Ren's Promise

Ren definitely knows more than he`s telling about Aichi and the Quatre Knights, but the only way Kai can get any information is by beating Ren in a Cardfight. Will Ren shut down Kai and his mates or will they get their first valuable clue to Aichi`s whereabouts?