The Kodomo No Omocha OVA is a thirty-minute animation video that was made before the TV series. It covers the first volume of the manga, so it's equivalent to TV episodes 1-6. It relates Sana's troubles with Hayama at school as a result of the "oyakodon baka" situation and culminates when Hayama's dad and sister realize their mistakes thanks to Sana's efforts.

After the intense quarterfinals, the U-17 World Cup competition has been whittled down to four formidable teams. Standing between Team Japan's quest for international glory is the nine-time tournament champion, Germany, and their star-studded team, pro player Jurgen Borisovich Volk at its helm. With both the momentum and the crowd's favor on the side of their opponents, Japan faces an uphill battle. Determined to avenge an earlier loss, Japan sends seven of their best—including team captain Houou Byoudouin—to challenge the German national team. But trying to reach the finals for the first time in Japan's tennis history may cause even these fearless players to crumble under mounting waves of pressure as they venture into uncharted territories.

Kenma Kozume has never considered volleyball fun or thrilling: it is merely something he is good at. But now Nekoma High School's volleyball team has qualified for the Spring Nationals and prepares to battle their long-standing rivals—Karasuno. Now, Kenma has to analyze the most confounding and resilient team and lead Nekoma to victory against them. Moreover, he will play against his friend Shouyou Hinata, Karasuno's short but incredibly proficient middle blocker. Karasuno has never been able to beat Nekoma in practice matches. Even so, despite his usual indifference, Kenma feels a tinge of excitement at the prospect of facing Karasuno in a high-stakes official game with no do-overs. To advance to the semifinals and ultimately restore their team's former glory, Karasuno must find a way to overcome Kenma's brilliant strategy and defeat Nekoma in their own territory.

Himari Kino is a cheerful and outgoing girl who is able to make friends with anyone she wants. When she enrolls in high school and attends the freshman opening ceremony, Himari falls in love with Yori Asanagi, a reserved upperclassman, during Yori's band performance. After the show, Himari blurts out her love, but Yori is inexperienced when it comes to romance. Yori, who did not expect this outcome at all, looks for answers from her friends and music. She decides to respond to Himari's confession, and to her surprise, Yori discovers that Himari fell in love with her music and performance rather than Yori as a person. Despite the shock, Yori desires to make Himari truly fall in love with her. The duo spend time together after school on the rooftop, where Yori usually plays her guitar with hopes to change Himari's feelings for her.