The basis of the hit trading card game and animation franchise, Cardfight!! Vanguard is a modern fantasy tale of trading card playing and making friends through gaming. In the game Vanguard, each player represents an astral spirit dueling on the fictional planet Cray. The cards in players' decks, called units, represent characters from Cray that players can summon. And due to its never-before-seen gaming style, Vanguard has become popular throughout the world.

In the fifth volume of Cardfight!! Vanguard, Kai has fallen to Ren and his Psyqualia abilities. And now Aichi is next on Ren's list to take down. Kai's plan to protect Aichi from Ren has failed miserably. He put up a great battle and took Ren to the limit, but ultimately his foresight was not good enough, his strength not powerful enough to defeat the defense Ren had built up in his psychic aggression.