In July 2020, a professional volleyball club in San Juan, Argentina, announced a new signing on Twitter. The name is Tooru Oikawa. A player of Japanese nationality. 27 years old. A skilled setter in volleyball back in high school, but Oikawa had never played professional volleyball in his life, for he was quite literally a fictional character.
UPCN San Juan Volley Club had made it official anyway. From printing jerseys to filming the coach — Fabián Armoa welcoming Oikawa to the team — he even started a trending tag: #OikawaEsDeUPCN.
Four years later, at the Paris Olympics, Japan and Argentina faced each other in men’s volleyball. Fans adorned with Oikawa merchandise and cosplay were paired with fans waving not only Argentina team banners but also banners of fictional Japanese high schools. The area during warm-ups with the Japanese team featured a well-known song to those fans — one of the opening theme songs Phoenix,” played in the series Haikyuu!!, where Oikawa came from. They were not alone. Overseas fans who had never cared for volleyball were setting 4 a.m. alarms to catch this match on a livestream. Not for the sport but for a fictional setter who had somehow made it real.
This is a story about how sports anime stopped being fiction and began rewriting how real athletes and fans engage with real sports.
Haikyuu!! debuted in 2012 as a manga, then, two years later, in 2014, the anime version debuted. It follows Shoyo Hinata, a short middle blocker who wants to become great despite his height. What had started as an underdog high school sports story became something bigger.
By 2024, the Japan Volleyball Association reported an increase in high school club memberships from 35,000 to more than 50,000. About a 43% increase since the series began. Former captain of Japan’s men’s national team, Masahiro Yanagida, spoke about how the anime helped drive the sport’s growing popularity. Ran Takahashi, current star on the national team, has said the series also helped people understand volleyball’s strategy and appeal.
This series doesn’t just show volleyball; it teaches it, too. Viewers learn rotations, quick attacks, and the libero position — the same language real coaches use.
That growth came from viewers who watched Haikyuu!! and decided to try volleyball for real. But Haikyuu!! It isn’t the only series pulling this off.
Predating Haikyuu!! by, over two decades, Slam Dunk, the basketball manga series by Takehiko Inoue, ran from 1990 to 1996. It follows Sakuragi Hanamichi, a self-proclaimed basketball genius, but a novice in his own right, who joins his high school team late. The series went quiet for 26 years till 2022, when The First Slam Dunk movie was released. Earning $258 million worldwide, proving the series hadn’t truly left.
The following year, on Aug. 27, at the 2023 FIBA World Cup, Japan beat Finland 98-88, securing their first win of the tournament and a spot in the Paris Olympics. After the buzzer, the star player Yuta Watanabe and point guard Keisei Tominaga met at center court and high-fived — mirroring the celebration Sakuragi and teammate Rukawa Kaede shared in the movie, two teammates who had spent the series competing against each other, finally celebrating together. FIBA’s official Twitter account posted this film still alongside the photo, captioned “Slam Dunk vibes.”
The parallels weren’t just a coincidence. Inoue, who remained a dedicated basketball fan himself, attended most of Japan’s FIBA matches and spent time with the players. Japan was hosting part of the tournament. The creator of the fiction was watching the reality unfold in real time.
I felt something similar when I watched The First Slam Dunk after a Spurs game. The rhythm of the plays and the tension before a shot. The way the momentum would shift — anime had captured that. Then I went back to the real game, understanding it better because of what I’d seen on screen.
The numbers and moments are quite striking, but they don’t fully explain why this happens. For that, we would need to talk to the people who grew up watching.
A 2025 study published in SHS Web of Conferences interviewed 20 youth from China and Japan about how sports anime affected them. The findings were consistent across both countries: viewers said anime didn’t entertain them — it changed how they approached sports and each other.
One Chinese respondent, a 22-year-old college student, said she had been afraid of ball sports until she watched Haikyuu!!, which got her started actually playing volleyball. A Japanese high schooler said Kuroko’s Basketball (“Kuroko no Basket”) inspired him to join his school’s basketball club. Another Japanese student bought basketball shoes after watching the same series and then began paying attention to sportswear in general.
The study found three main effects. First, sports participation — youth reported trying sports they had never considered because anime made the rules and the strategies accessible. Second, cultural identity — viewers in both countries identified with the values of teamwork, perseverance, and collective effort. Third, economic awareness — fans bought merchandise, sports equipment, and started following real brands.
But the consumer behavior isn’t what stands out; it’s the social learning behind it. The study mentions Social Learning Theory: prolonged exposure to sports anime leads youth to absorb and imitate the behaviors depicted in it. They see characters struggle, fail, and keep going. Then they do the same.
This isn’t unique to Japan. Another Chinese respondent said that the concept of “coexistence of competition and friendship” in anime changed how he handled real-life competition. Another said he had learned to focus on enjoying the process rather than just the results.
The researchers note the limitations — having only 20 interviews with mostly high schoolers and college students from East Asia. But the pattern is clear enough. Sports anime creates a feedback loop that transcends borders and age ranges. Fiction inspires real action. Those actions reinforce the values fiction teaches. And those values of teamwork, grit, collective identity — are what keep people in sports longer after the credits roll.
Even I am part of those statistics. I’ve been an avid fan since 2014, when Haikyuu!! started airing. I was not very much a sports person. I didn’t care too much about sports like volleyball, basketball, rugby, or even sumo, for that matter. But from starting with Haikyuu!! as well as Kuroko’s Basketball, that is where I can confidently say a shift had started. Then came the likes of All Out!! and Hinomaru Sumo, then the likes of Blue Lock and The First Slam Dunk. These specific sports anime have piqued my interest in the actual sports themselves, and I look forward to adding to this list by understanding them in ways the average sports fan doesn’t.
It wasn’t just the stories, but the specificity of it all, too. I learned what a quick attack looks like. I understood why a libero wears a different jersey. I started noticing when a real setter ran offensive plays because of what the anime had taught me about the language. Hinomaru Sumo had also given me the same language to understand sumo. Going from someone who knew nothing about the sport to finding myself following real tournaments and understanding the rank system. The First Slam Dunk had a rhythm I could pick up on since seeing an actual Spurs game: the tension before a shot, the way momentum swings, and the release when a play works.
That’s the power of this crossover — it doesn’t just turn viewers into fans. It turns fans into people who actually understand the game. I went from not being able to engage when sports came up in conversation to now being able to hold a conversation about a striker’s positioning, a point guard’s vision, or even the perfect try in rugby, from not caring to caring, and from caring to at least understanding the basics.
Sports anime had stopped being fiction for me a long time ago. The rosters just caught up.