Cardfight!! Vanguard: Legion Mate-hen

After a global conflict with Link Joker, peace is restored, but Kai Toshiki encounters an unexpected problem. Sendou Aichi, who saved the world from Link Joker, vanishes without a trace, and all memories of him disappear. Kai uses "Blaster Blade" and the Royal Paladin deck, the only remaining clues to Aichi's existence and their connection, to search for him. He is confronted by four powerful vanguard fighters known as the "Quatre Knights"—Gaillard, Neve, Ratie, and Sarah—who possess enigmatic abilities and tell him to stop his search. Their motives and ties to Aichi remain unclear. Equipped with the new power "Legion," Kai engages in battle to recover Aichi, marking the start of a new conflict.