自古以来，人类与海洋的渊源就颇为深厚，人类之所以能够进步和发展，也和海洋有着不可否认的关系。然而，在海洋资源被大力开采的同时，严重的污染也随之而来，越来越频繁的海洋灾害让人类吃了不小的苦头。乌贼娘（金元寿子 配音）是海里的忠实居民，看着生存的家园被破坏，忍无可忍的她决定给人类一个小小的教训。 初涉陆地的乌贼娘还有些不太习惯，顶着一副可爱迷糊的萝莉外形，还未教训人类，自己就先失手打破了海之家的墙壁。无奈之下，乌贼娘只得留在海之家做打工妹来偿还墙壁修补的债务。在海之家，乌贼娘认识了个性好强的相泽荣子（藤村歩 配音），温柔可人的相泽千鹤（田中理惠 配音），活泼好动的相泽武（大谷美贵 配音）。对于乌贼娘来说，虽然惩戒人类的大计尚未成功，但是就这样和朋友们快乐的在一起，好像也是一种不错的选择。

本作品主角三桥廉是个希望自己成为所属球队王牌投手的少年，在中学时期被认为靠着爷爷是三星学园经营者的关系，才能成为该校棒球部的王牌投手，因此队友对三桥有着极大的反感，结果不但造成其在中学三年一胜难求，更导致他懦弱、自卑又孤僻的个性，甚至一度考虑放弃棒球。 三桥毕业后决定不直升三星学园的高等部，转赴埼玉县投考高校，并进入县立西浦高校就读。他在社团展览徘徊，之后抱着只是看看的心情走到棒球部，没想到意外被教练百枝麻里亚半强迫地加入，而且是全队唯一曾经固定担任投手位置的球员，顺理成章成为西浦高校棒球部的投手。 该校棒球部全体成员都是一年级，且刚从软式棒球转型成硬式棒球。三桥在捕手阿部隆也的引导下发挥出苦练而成的极精准控球能力，通过一场场的比赛、兼顾技术及心理层面的严格训练及队友间的紧密互动，三桥逐渐找到自信心及朋友间的信任感，全队携手朝着甲子园优胜的目标迈进。 【STAFF】 原作：樋口朝「振臂高挥」（讲谈社 月刊「AFTERNOON」连载） 监督：水岛努 系列构成：黑田洋介 人物设定：吉田隆彦 总作画监督：高田晃、谷口淳一郎 动作作画监督：谷口淳一郎 音乐：浜口史郎 音乐监督：菊田浩巳 动画制作：A-1 Pictures 制作：大振制作委员会 【CAST】 三桥廉：代永翼 阿部隆也：中村悠一 花井梓：谷山纪章 田岛悠一郎：下野纮 冲一利：佐藤雄大 荣口勇人：铃木千寻 巢山尚治：保村真 水谷文贵：角研一郎 泉孝介：福山润 西广辰太郎：木村良平 筱冈千代：福圆美里 百枝真理矢：早水リサ 滨田良郎：私市淳

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 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 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.