"Cardfight!! Vanguard: Link Joker Hen" is the third season of the "Cardfight!! Vanguard" anime series, continuing the story of Aichi Sendou and his friends as they face a new and formidable threat. The narrative centers on the emergence of the Link Joker, an alien force that seeks to control the planet Cray, the world where the Vanguard cards originate. This invasion begins to affect Earth, as the Link Joker's influence corrupts the cards and their users, turning them into mind-controlled adversaries.

Aichi Sendou, the protagonist, is a skilled Vanguard fighter who must confront the growing chaos caused by the Link Joker. Alongside his friends, including Toshiki Kai, Misaki Tokura, and Kamui Katsuragi, Aichi works to protect both Cray and Earth from the Link Joker's destructive plans. The group faces numerous challenges as they battle corrupted fighters and attempt to uncover the true nature of the Link Joker's invasion. The stakes are heightened as the Link Joker's power grows, threatening to engulf both worlds in darkness.

The season introduces new characters, such as Ren Suzugamori, a former rival who becomes a key ally, and Reverse Fighters—individuals whose cards have been corrupted by the Link Joker, forcing them into antagonistic roles. The narrative explores themes of unity, resilience, and the importance of bonds, as Aichi and his friends strive to overcome the Link Joker's influence and restore balance. The story builds toward a climactic confrontation, where the fate of Cray and Earth hangs in the balance, culminating in a resolution that tests the strength of the characters' convictions and their ability to work together.