Ever since having witnessed the Little Giant and his astonishing skills on the volleyball court, Shouyou Hinata has been bewitched by the dynamic nature of the sport. Even though his attempt to make his debut as a volleyball regular during a middle school tournament went up in flames, he longs to prove that his less-than-impressive height ceases to be a hindrance in the face of his sheer will and perseverance. When Hinata enrolls in Karasuno High School, the Little Giant's alma mater, he believes that he is one step closer to his goal of becoming a professional volleyball player. Although the school only retains a shadow of its former glory, Hinata's conviction isn't shaken until he learns that Tobio Kageyama—the prodigy who humiliated Hinata's middle school volleyball team in a crushing defeat—is now his teammate. To fulfill his desire of leaving a mark on the realm of volleyball—so often regarded as the domain of the tall and the strong—Hinata must smooth out his differences with Kageyama. Only when Hinata learns what it takes to be a part of a team will he be able to join the race to the top in earnest.

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.

After the victory against Aoba Jousai High, Karasuno High School, once called “a fallen powerhouse, a crow that can’t fly,” has finally reached the climax of the heated Spring tournament. Now, to advance to nationals, the Karasuno team has to defeat the powerhouse Shiratorizawa Academy. Karasuno’s greatest hurdle is their adversary’s ace, Wakatoshi Ushijima, the number one player in the Miyagi Prefecture, and one of the country’s top three aces. Only the strongest team will make it to the national tournament. Since this match is the third-year players’ last chance to qualify for nationals, Karasuno has to use everything they learned during the training camp and prior matches to attain victory. Filled with restlessness and excitement, both teams are determined to come out on top in the third season of Haikyuu!!.

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!