Cardfight!! Vanguard: Season 4, Episode 30

4 - 30: Sword of Destruction

At long last, Kai faces off against Aichi! But if Kai loses, he, Ren, Leon, and Naoki will become the new Quatre Knights to watch over a sealed Aichi! On top of that, Aichi whips out his powerful, corrupted avatar... Blaster Joker!