A chance event triggered Shouyou Hinata's love for volleyball. His club had no members, but somehow persevered and finally made it into its very first and final regular match of middle school, where it was steamrolled by Tobio Kageyama, a superstar player known as "King of the Court." Vowing revenge, Hinata applied to the Karasuno High School volleyball club... only to come face-to-face with his hated rival, Kageyama!

After losing against Aoba Johsai, the whole Karasuno team feels at a loss. Especially Kageyama and Hinata, who seem to be the most devastated about the defeat. However, the team soon cheers up when a chance for them to go to Tokyo appears. During their training camp there, Karasuno will meet new formidable opponents.

After the victory against Aoba Johsai 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 Haikyu!!.

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.

Former ace runner Kakeru grudgingly returns to the sport when college senior Haiji recruits him to an unlikely team with one goal: the Hakoden relay.

双叶翔太郎（土屋神叶 配音）是一名刚刚升上高中的校园新鲜人，初三那年夏天，因为被苍高男子艺术体操社的表演所吸引，翔太郎选择考入这所学校，并且加入了体操社，在这里，他结识了一群志同道合的伙伴们。
具备高超的实力但总是拒人于千里之外的美里良夜（石川界人 配音）、温柔可靠，课余兴趣是栽培盆栽的副社长筑馆敬助（近藤隆 配音）、社里唯一的正常人女川长吉（下野纮 配音）、外表看上去有点吓人但性格十分细腻善良的亘理光太郎（神谷浩史 配音），和这些可靠的前辈们在一起训练，翔太郎虽然对艺术体操一无所知，但凭借着自己的天赋和努力的汗水，他迅速的成长着。