Following their triumph over Shiratorizawa Academy, the Karasuno High School volleyball squad secures their coveted spot at the national championships. While star setter Tobio Kageyama joins the prestigious All-Japan Youth Training Camp, his teammate Kei Tsukishima heads to a special rookie session in Miyagi Prefecture. Feeling excluded from official invitations, the spirited Shouyou Hinata refuses to be sidelined. Turning his frustration into determination, he daringly infiltrates Tsukishima's camp as a ball boy, viewing this as a chance for growth. As the national tournament looms closer, Karasuno's players strive to address their weaknesses, enhance their abilities, and aim for the pinnacle of success.