Inspired after watching a volleyball ace nicknamed "Little Giant" in action, small-statured Shouyou Hinata revives the volleyball club at his middle school. After finding new members, they set out for the middle school tournament, where they cross paths with a formidable school with the "King of the Upper Court", Tobio Kageyama. Hinata vows to surpass Kageyama, and so after graduating from middle school, he joins Karasuno High School's volleyball team—only to find that his sworn rival, Kageyama, is now his teammate.