Cardfight!! Vanguard

Season 1, Episode 21

Episode Title: Abyss of Darkness

Air Date: 2018-09-22

Overview:

Teams Q4 and AL4 gather at the Asteroid headquarters. Kai fights Ren in a decisive battle to protect Aichi. The battle begins between Kai, who denies the power of PSYqualia, and Ren, who is overflowing with that power.