The Inter-High has finally arrived for Karasuno High School's volleyball team. Their opponent at the tournament is Date Tech High School—the team that crushed Karasuno the year prior. The loss brings back anxiety and fear for the team's second- and third-years as they were unable to overcome Date's read block. With the dynamic freshmen duo Shouyou Hinata and Tobio Kageyama on their side, will Karasuno be able to overcome their past and break through the iron wall? Awaiting Karasuno in the next round is the elite Aoba Jousai High School, led by the cunning captain Tooru Oikawa. Coming from the same middle school as Kageyama, Oikawa is a talented and unpredictable setter with a grudge against his former teammate. It is a battle between genius setters to decide who will continue on in the Inter-High.

An intense battle rages on at the Tokyo Qualifiers for the three remaining spots in the national volleyball competition. Nekoma High School, Fukurodani High School, Nohebi Academy, and Itachiyama Academy all passionately strive to participate in the tournament. Despite various issues on the court, Nekoma especially wishes to prove they are worthy of moving on to the national level. As the teams aim to secure their place by overcoming both their opponents and their own weaknesses, the Tokyo Qualifiers determine which teams will reign victorious and join the national competition.

After their triumphant victory over Shiratorizawa Academy, the Karasuno High School volleyball team has earned their long-awaited ticket to nationals. As preparations begin, genius setter Tobio Kageyama is invited to the All-Japan Youth Training Camp to play alongside fellow nationally recognized players. Meanwhile, Kei Tsukishima is invited to a special rookie training camp for first-years within the Miyagi Prefecture. Not receiving any invitations himself, the enthusiastic Shouyou Hinata feels left behind. However, Hinata does not back down. Transforming his frustration into self-motivation, he boldly decides to sneak himself into the same rookie training camp as Tsukishima. Even though Hinata only lands himself a job as the ball boy, he comes to see this as a golden opportunity. He begins to not only reflect on his skills as a volleyball player but also analyze the plethora of information available on the court and how he can apply it. As the much-anticipated national tournament approaches, the members of Karasuno's volleyball team attempt to overcome their weak points and refine their skills, all while aiming for the top!

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.