An adaptation of the Future Card Buddyfight card game. Future Card Buddyfight takes place in a more futuristic version of today. The card game connects to a parallel universe through special cards (Buddy Rare Cards) that act as portals. They bring monsters to Earth in order for them to become buddies with humans. Through friendship and courage, they take on and fight challenges, known as Buddyfights, where people of all ages have friendly non-hurtful competitions. The main character, Gaou Mikado has just started Buddyfighting. As the story progresses, Buddyfights are seeming to become a little too real...

Following their participation at the Inter-High, the Karasuno High School volleyball team attempts to refocus their efforts, aiming to conquer the Spring tournament instead. When they receive an invitation from long-standing rival Nekoma High, Karasuno agrees to take part in a large training camp alongside many notable volleyball teams in Tokyo and even some national level players. By playing with some of the toughest teams in Japan, they hope not only to sharpen their skills, but also come up with new attacks that would strengthen them. Moreover, Hinata and Kageyama attempt to devise a more powerful weapon, one that could possibly break the sturdiest of blocks. Facing what may be their last chance at victory before the senior players graduate, the members of Karasuno's volleyball team must learn to settle their differences and train harder than ever if they hope to overcome formidable opponents old and new—including their archrival Aoba Jousai and its world-class setter Tooru Oikawa. [Written by MAL Rewrite]

While Tasuku is off training and getting rest in the world of the monsters, the Buddy Police sees the need to deputize some of the champions to help protect the Earth. Gao, Tetsuya, and Zanya Kisaragi are among those deputized, and it's just in time. A new enemy arrives, Ikazuchi, with the deadly 100 demons, all rogue monsters. Now the new trainees and the Great 8 monsters must fight to protect Earth from being consumed by these new rogues. (Source: ANN)

Third season of Future Card Buddyfight.