Why Is That Time I Got Reincarnated as a Slime Season 4 Split Into 5 Cours?
When I first heard that That Time I Got Reincarnated as a Slime Season 4 was being planned as a massive five-cour project, my first reaction was honestly simple: That is either completely insane or exactly what Tensura needs.
After thinking about where Rimuru’s story is heading, I’m leaning strongly toward the second option.
Most anime seasons are lucky to get 12 or 13 episodes. Even major franchises often receive two cours and then disappear for a year or longer. So the idea of Tensura Season 4 stretching across five cours and more than 60 episodes immediately feels unusual. But if you have followed the series beyond its flashy battles, you already know that Tensura has become much bigger than a typical isekai adventure.
This is no longer just a story about Rimuru defeating monsters, building Tempest, and unlocking increasingly ridiculous abilities. The series has evolved into a huge political fantasy involving nations, alliances, religion, economics, military strategy, ancient powers, and an enormous cast of characters.
And honestly, that is exactly why I think the five-cour approach could work.
Tensura Has Simply Become Too Big for a Normal Season
The biggest reason I can understand the five-cour structure is the sheer amount of material that needs to be adapted from Fuse’s Light Novels.
As the story progresses, the books become increasingly dense. There are major battles, of course, but there are also long conversations, political negotiations, character motivations, explanations of abilities, military preparations, and world-building details that might look unnecessary on paper but become important later.
This is also where the infamous “meeting room” criticism comes from. Some anime viewers get frustrated when Rimuru and his allies spend an entire episode discussing plans instead of fighting someone. I completely understand that reaction. But as someone who enjoys Tensura specifically because of its world-building, I would rather watch a slower political episode than see an entire subplot destroyed by rushed adaptation.
A five-cour Season 4 gives the anime something it rarely gets: breathing room.
Instead of forcing several major Light Novel events into a tiny number of episodes, the production can potentially allow important developments to actually develop. Characters who normally would receive only a few minutes of screen time can get meaningful moments, while political conflicts don’t have to be reduced to exposition dumps.
Why the Five-Cour Format Makes Sense for the Story
There is another important factor here. Tensura is reaching the point where everything that happened earlier starts to matter on a much larger scale.
Rimuru’s rise from a mysterious slime into the ruler of Tempest completely changes the balance of power in the world. Other countries can no longer treat him as some strange monster who happens to have a friendly city. Tempest is becoming a genuine political and military power.
That means the story naturally needs more time.
The larger conflicts surrounding the Western Nations, the Rozzo family, the various political powers and the eventual confrontation with the Eastern Empire aren’t storylines that can comfortably breathe inside a rushed 12-episode package.
If the anime tried to speed through everything, I think we’d end up with the worst possible version of Tensura: spectacular scenes surrounded by missing context.
Personally, I’d much rather have an episode where Rimuru spends twenty minutes planning something complicated if that decision pays off ten episodes later.
What Fans Actually Gain From a Longer Season
A five-cour structure isn’t automatically good just because it is long. The execution still matters. But assuming Studio 8bit uses the additional runtime intelligently, there are some major advantages.
- More faithful Light Novel adaptation: Important conversations and world-building don’t have to be sacrificed.
- Better character development: Supporting characters can receive proper arcs instead of disappearing into the background.
- More satisfying political storylines: Tempest’s relationships with other nations can develop naturally.
- More time for major battles: Climactic fights can receive the animation and pacing they deserve.
- Less rushed storytelling: The anime doesn’t have to sprint from one major event to another.
That last point is probably the most important to me.
Tensura is one of those franchises where the destination isn’t always the most interesting part. I enjoy watching Rimuru build his civilization, negotiate with powerful people, discover new threats, and slowly realize just how enormous the world around him really is.
The Manga Problem Is More Important Than It Looks
There is also a practical issue that fans sometimes overlook: the manga moves much more slowly than the anime.
The main manga adaptation is published monthly, which naturally limits how quickly new material becomes available. A television anime moving at full speed can consume manga content surprisingly quickly.
That creates an awkward situation for the production committee. If the anime constantly releases new episodes without meaningful breaks, it can eventually catch up with the manga and create a serious adaptation problem.
The five-cour structure provides a possible middle ground.
The producers can announce a huge overall Season 4 project while still separating the actual broadcast into manageable sections. That gives the manga time to build up additional chapters while keeping the anime franchise active.
From a business perspective, it is also much more attractive than simply announcing that fans will have to wait several years for another season.
And Then There Is Studio 8bit
I’m also glad that the format includes breaks between different portions of the season because producing Tensura is not exactly a small undertaking.
Studio 8bit has been associated with the main Tensura anime since the beginning, and the series has gradually become more ambitious visually. The franchise now demands large-scale magic effects, monster designs, enormous environments and increasingly complicated action sequences.
Trying to produce more than 60 episodes and air every single one without meaningful production breathing room would be asking for trouble.
That’s why I see split cours as a production safety net rather than a negative.
Ideally, the breaks give animators and other staff additional time to polish episodes instead of forcing everyone into emergency production mode. And when Tensura eventually reaches its biggest battles, that extra preparation could make a noticeable difference.
Five Cours Also Keeps Tensura Everywhere
There is no denying the business side of this either.
Tensura is no longer just an anime. It is a huge multimedia franchise with manga, Light Novels, games, merchandise, movies, collaborations and countless promotional projects.
Keeping the anime active across an extended period gives the franchise something extremely valuable: constant visibility.
Instead of having Tensura dominate the conversation for three months and then disappear, the five-cour strategy can keep Rimuru and Tempest in the spotlight for a much longer period.
That means more opportunities for:
- new merchandise releases,
- game promotions and collaborations,
- special events and pop-up stores,
- movie and Blu-ray promotions,
- and continued international streaming attention.
From a fan perspective, I’m obviously more interested in the anime itself than the marketing strategy, but I can’t pretend this part doesn’t matter. A successful franchise needs to remain commercially healthy if we want the story to continue receiving ambitious adaptations.
What About the Long Breaks?
This is probably the biggest downside.
If you are the kind of viewer who hates waiting after a major cliffhanger, five split cours could be brutal.
Imagine reaching an enormous battle, watching Rimuru make a major decision, and then suddenly having to wait months for the next section. That’s going to hurt.
But I’d still take that over watching the studio rush through the material simply to maintain a weekly schedule.
We’ve seen enough anime productions suffer because they tried to maintain impossible schedules. A carefully planned break can be frustrating, but poor production quality is much harder to forgive.
| Approach | Potential Benefit | Potential Problem |
|---|---|---|
| One 12-Episode Season | Fast and easy to follow | Too much material gets cut |
| Two-Cour Season | More room for adaptation | Still limited for Tensura’s scale |
| Five Split Cours | Maximum storytelling and production flexibility | Longer waits between parts |
My Biggest Hope for Tensura Season 4
If I could ask Studio 8bit for one thing, it wouldn’t actually be more action.
I’d ask them to trust the slower parts of the story.
One of the things that makes Tensura different from many other isekai series is that Rimuru’s power isn’t the only thing driving the plot. Tempest itself is fascinating. Watching a nation develop, seeing different factions react to Rimuru’s existence, and understanding how his decisions affect the wider world can be just as entertaining as watching him destroy an enemy.
So if five cours means we get more of that, I’m completely on board.
Of course, there will always be viewers who want the next giant fight immediately. That’s perfectly fair. But for me, the best version of That Time I Got Reincarnated as a Slime Season 4 would be one that lets the story breathe before unleashing its biggest moments.
Final Thoughts: Five Cours Could Be Exactly What Tensura Needs
At first glance, five cours sounds excessive. More than 60 episodes under one Season 4 banner is certainly not normal by modern anime standards.
But when I look at the scale Tensura has reached, it actually feels strangely appropriate.
The Light Novel story is enormous. The political side of the series is becoming increasingly important. The manga needs time to stay ahead. Studio 8bit needs a manageable production schedule. And the franchise itself has grown into a multimedia giant that benefits from staying in the spotlight.
So yes, I understand why some fans are nervous about the long breaks. I am too. Nobody enjoys waiting months when a story is getting really good.
Still, if the choice is between 60+ carefully paced episodes with production breathing room and a shorter season that cuts half of the material to reach the big fights faster, I’ll take the first option every time.
Rimuru has spent years building Tempest into something far larger than anyone expected. It would be pretty ironic if his anime adaptation suddenly tried to rush everything.
For me, the five-cour structure isn’t a sign that Tensura Season 4 is too ambitious. It’s a sign that the story has finally become big enough to justify an adaptation on this scale.
And if Studio 8bit gets the pacing, production quality and major story moments right, this could end up being one of the most memorable eras in the entire Tensura anime.
