Several days after the mortal battle against Link Joker which embroils the whole world, the world has returned to peace. But Kai Toshiki faces a surprising situation. Sendou Aichi, the hero who saved the world from the invasion of Link Joker, has suddenly disappeared. In addition, everyone's memory about Aichi is lost...Almost all hints have been lost, and Kai starts to search Aichi with Blaster Blade and the deck of Royal Paladin, the only existing hint and the proof of their bonds. Kai is approached by fighters who call themselves Quatre Knights. The four---Gaillard, Neve, Ratie and Sarah---are fighters with world-class power in vanguard fights. They control mysterious power and urge Kai to give up searching Aichi. What is their purpose...!? And what is their relationship with Aichi...!? Kai, with the new power Legion in his hand, fights to take Aichi back. Now, the war has begun! (Source: Cardfight!! Vanguard Wikia)

Ten-year-old Sakura Kinomoto is an ordinary fourth-grade student living in Tomoeda until, one day, she stumbles upon a mysterious book of cards titled The Clow. Pondering over her discovery, she unintentionally causes a magical gust of wind to scatter the cards all over town. The accident awakens the Beast of the Seal—Keroberos, nicknamed Kero—who tells Sakura that she has released the mystical Clow Cards created by the sorcerer Clow Reed. Due to each Card's ability to act independently and their incredible power, Clow had sealed them away. Now that they have been set free, the Cards pose great danger to the world, and it is up to Sakura to put an end to them. Appointing Sakura as the Cardcaptor and granting her the Sealed Key, Kero tasks her with finding and recapturing all the Clow Cards. Alongside her best friend Tomoyo Daidouji, and with Kero's guidance, Sakura must learn to balance her new secret duty with the everyday troubles as she takes flight on her magical adventures as Cardcaptor Sakura.

The main protagonist Sendou Aichi, is a timid and mundane third-year middle school boy. The thing that supported Aichi's heart, was the Blaster Blade card that he received as a child. It's an important rare card from Vanguard, a card game with the imaginary world of Planet Cray as its stage. From the day he reunited with the person who gave him that card Toshiki Kai, Aichi's everyday life began to change. (Source: Crunchyroll)

Shy and timid in nature, 15-year-old Yu-yu Kondou is constantly pressured by his wacky sisters to fulfill their unreasonable requests. One day, they force their brother to crossdress for the sake of their own entertainment, prompting him to run away from home. Following a series of unexpected events, Yu-yu encounters Megumi Ookura, a friendly girl who introduces him to Team Blackout—a group of individuals deeply involved in a card game called Cardfight Vanguard. As he increasingly connects with the members of Team Blackout—Danji Momoyama, Zakusa Ishigame, Tomari Seto, and Megumi herself—Yu-yu discovers a whole new and exciting world, one he could have never imagined without the help of his newfound friends.