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!!.

Kumiko and her teammates have won the Kyoto regional tournament. From now on, life will be getting a lot more hectic. With the national tournament fast approaching, Kumiko's band is doubling down on practice and discipline, leaving little time for sleep or other recreational activities. The redoubled practice schedule brings Kumiko and Reina closer together, but elsewhere in the band, it seems like drama threatens to tear the group's unity apart. The ghost of the prior year's mass band exodus still haunts many of Kumiko's classmates, and with former band member Nozomi Masumi now asking to return, it seems like the grudges of the past will soon be impossible to ignore.