If you’ve spent any time in anime communities, you’ve probably seen people throw around phrases like “this is a Winter 2025 anime” or “it’s a split-cour” and just nodded along, hoping it would make sense eventually. It does, once someone actually explains it properly. The system Japan uses to broadcast anime is genuinely different from how Western TV works, and understanding it makes the whole experience of following anime a lot less confusing.
The four seasons
The Japanese broadcasting calendar divides the year into four quarterly blocks that align with the actual seasons. Winter runs from January through March, Spring covers April through June, Summer goes from July through September, and Fall handles October through December. Every three months, a new wave of anime launches, older ones wrap up, and the cycle starts again. Four times a year, every year, in most cases.
This is completely different from how American television operates. A US network show might air 22 episodes over nine months, take a summer break, come back in the fall, and repeat. Anime usually doesn’t work like that. Each quarterly block is often treated as its own contained event, and studios plan their entire release schedule around hitting those specific windows. Missing the start of a season can mean waiting until the next one, which is why delays in anime production are such a big deal.
What is a cour?
This is the word that confuses most newcomers, and it’s also the most important one to understand. A cour, pronounced “koor,” comes from the Japanese word “kuuru,” which itself was borrowed from the French word “cours,” meaning course. Anime fans started using it in English communities around the mid-2000s, and it stuck. Think of a cour the same way you’d think of a semester at school: a fixed period of time with a set amount of content.
One cour equals roughly 12 to 13 episodes aired weekly over a single three-month broadcast season. That’s why the overwhelming majority of anime series land somewhere around that episode count. It isn’t laziness or budget issues; it’s largely how the broadcasting calendar is structured. A studio typically gets a three-month slot, fills it with weekly episodes, and that’s your cour. Simple enough on its own, but it gets more complicated once you factor in how different shows use multiple cours.
Single cour, double cour, and split cour
A single cour anime is the most common format by far. Twelve or thirteen episodes, one season, done. Shows like Chainsaw Man, Erased, and Tomo-chan Is a Girl all fit neatly into this format, telling a complete story within a single three-month window. The story is designed to wrap up within that time, or at least reach a satisfying stopping point. For studios adapting manga or light novels, a single cour is also the lowest-risk approach because they release the anime, see how people respond, and then decide whether to greenlight more.
A double cour anime runs for two consecutive seasons without a break, which gives you roughly 24 to 26 episodes. Jujutsu Kaisen Season 1 is a good example, airing continuously from Fall 2020 into Winter 2021 with no interruption. More classic examples include Attack on Titan Season 1, which ran straight through 25 episodes in 2013–2014 without a break. Delicious in Dungeon did the same thing in 2024, running from Winter straight through Spring. In other words, the episodes never stop. One season flows directly into the next with no gap between them.
Split cour is where things get genuinely confusing, and it’s also where most of the arguments in anime communities happen. A split cour anime has roughly 24 to 26 episodes total, but instead of airing them back-to-back, the studio releases the first half, takes a break of about one season (~three months) where something else airs in that slot, and then comes back with the second half. For example, both Mushoku Tensei: Jobless Reincarnation and Re:Zero − Starting Life in Another World used this format, while more recent shows like 86: Eighty-Six have followed a similar split cour approach. The two halves are technically one production season, one unified story, but the break in the middle makes it look and feel like two separate things. To make matters worse, database sites like MyAnimeList sometimes list them separately, which might confuse people further.
Why does any of this exist?
The honest answer is logistics. Japanese animation studios operate with tight schedules, small teams compared to Western TV productions, and budgets that require careful management. Giving a show a 12-episode slot is a way for broadcasters to test audience reception before committing to a longer run. If the first cour performs well in ratings and merchandise sales, the production committee, which is the group of companies that funded the anime in the first place, can greenlight a second cour or a full second season. If it doesn’t, the studio moves on without having burned through resources on 24 episodes of something nobody watched.
The split cour format exists for a similar reason, except it’s more about managing production quality. Delivering 24 episodes of animation at a consistently high level within six consecutive months is genuinely brutal for animation staff. Giving the studio a three-month break mid-production lets them catch up, refine the second half, and come back stronger rather than rushing episodes that look noticeably worse toward the end. Several of the biggest anime in recent years have used this approach specifically to avoid the kind of animation quality drop that One Punch Man Season 2 became infamous for.
How this differs from the West
American network TV was traditionally built around longer seasons, often 20 or more episodes per year, airing over most of the year with a summer break. That system made sense when television was the only screen in the living room and networks needed to hold audience attention for as long as possible.
Now, anime never operated that way. The cour system means a show airs intensely for three months, builds a concentrated burst of community discussion and fan activity, wraps up, and then leaves people waiting for the next installment. That anticipation between cours, and especially between full seasons, is actually a significant part of how anime fanbases work. The week-to-week discussion during a cour, the theories, the reaction videos, the discourse, is almost as much a part of the experience as the show itself.
Interestingly, streaming services have changed the traditional network TV model. Nowadays, many new series run shorter seasons, more like anime cours, with 6–13 episodes released weekly or all at once. Favorite series like Stranger Things, The Witcher, and House of the Dragon follow this format, giving concentrated story bursts that generate intense fan discussion and anticipation between seasons.
What about streaming?
Netflix and other streaming platforms complicated this further by occasionally dropping entire seasons at once instead of weekly episodes, which changes the viewer experience from the traditional weekly rhythm to binge‑viewing.
Many anime were originally created with broadcast cours in mind, but streaming releases don’t always line up with those seasonal windows; Netflix, in particular, has released titles outside the usual Japanese broadcast schedule.
Crunchyroll and most anime‑specific platforms still follow the simulcast model, releasing episodes weekly as they air in Japan, which preserves the seasonal, week‑to‑week community experience.
The long-running exception
All of the above applies to most anime, but there’s a category that throws the whole system out the window, and that is long-running shonen series, such as Naruto, One Piece, Bleach, and Dragon Ball. They air continuously for years, sometimes decades, filling the gap between manga chapters with what fans call filler, original content that isn’t in the source material.
Curiously, One Piece has been airing since 1999 and is still going. These shows operate on a completely different broadcasting logic, designed to never leave the air long enough for the audience to build the habit of watching something else.
Now, understanding the cour system won’t change what you watch, but it will change how you follow it. Knowing that a single cour anime wraps up in three months, that a split cour is coming back after a break rather than being cancelled, and that a new season of something you love is three months away rather than a year, makes the whole thing feel a lot less random and a lot more like the deliberately structured system it actually is.
