That Time I Got Reincarnated as a Slime Season 4 First Half Review: Rimuru’s World Is Getting Bigger and More Dangerous

That Time I Got Reincarnated as a Slime has always been one of those anime series that understands exactly what it wants to be. It is not simply about an overpowered main character defeating the next villain standing in his way. At its core, this has been a story about building a nation, creating alliances, navigating politics, and watching Rimuru Tempest slowly become one of the most important figures in the entire world.

The first half of Season 4 continues pushing the series in that direction, and so far, we are enjoying where the story is headed.

One of our biggest complaints about previous seasons was the pacing. There were times when it felt like we spent more time sitting in meetings than actually moving the story forward. Yes, the politics and world-building are important, but there is only so much time we can spend around a table discussing Tempest’s next move before we start wondering when somebody is going to actually make a move.

Season 4 feels different.

The political elements are still here, but now there is a growing sense that all these conversations, alliances, and decisions are building toward something much bigger. Tempest is no longer a small monster nation trying to earn the respect of the world. Rimuru is a Demon Lord. Tempest is a major economic and military power. Other nations are watching, planning, and in some cases becoming increasingly concerned about how powerful Rimuru and his people have become.

And they probably should be.

Rimuru Is Becoming More Than Just an Overpowered Slime

The most interesting direction of the series is Rimuru’s evolution as a leader.

We already know Rimuru is ridiculously powerful. At this point, watching him gain another ability or defeat another enemy is almost expected. The bigger question is what happens when power alone cannot solve every problem.

Rimuru wants humans and monsters to coexist. He wants Tempest to become a place where different races can live, work, and prosper together. It sounds simple, but the larger Tempest becomes, the more people have a reason to fear it.

That is where Season 4 has become interesting.

Rimuru is learning that being a good person does not automatically make everyone trust you. His intentions may be peaceful, but from the outside looking in, he is a Demon Lord commanding an army filled with monsters powerful enough to destroy entire nations.

Imagine being a neighboring kingdom and watching Tempest grow.

Every few months, Rimuru has another powerful ally. Another Demon Lord is friendly with him. Another legendary creature is casually walking around his city. Diablo is somewhere smiling like he already knows how everyone is going to die.

We understand why some people are nervous.

The series appears to be moving Rimuru into a position where he will have to decide how far he is willing to go to protect his dream. Can Rimuru continue being the friendly and forgiving leader we know, or will the world eventually force him to become the Demon Lord everyone already fears?

That may be one of the biggest questions moving forward.

The Threat Against Tempest Feels More Strategic

What we also appreciate about this season is that the enemies surrounding Tempest are becoming smarter.

Trying to simply attack Rimuru directly would be stupid.

We have already seen what happens when people underestimate Tempest.

The more dangerous approach is political manipulation, economic pressure, misinformation, and creating situations where Rimuru cannot simply overpower the problem.

The conflict involving the Rozzo family and the growing tension surrounding Tempest adds another level to the story. Granville and Maribel Rozzo represent a different kind of threat because their opposition to Rimuru is connected to their own vision of protecting humanity. Meanwhile, Leon continues pursuing his own agenda in El Dorado.

Everyone seems to have a plan.

The problem is that we still do not completely understand all of those plans.

And that is exactly why the second half of the season has so much potential.

Can Yuuki Actually Be Trusted?

One of the biggest unanswered questions continues to surround Yuuki Kagurazaka.

We have been watching this man for multiple seasons, and we still do not know exactly where his loyalty lies.

Is Yuuki an enemy?

Is he an ally?

Is he simply using everyone around him until he gets what he wants?

Every time it feels like the series is ready to give us a clear answer, another layer is added to his character. His actions continue to create questions, and even Raphael’s suspicions make it difficult to completely accept Yuuki’s explanations.

The second half of the season needs to start giving us real answers about Yuuki.

At some point, Rimuru is going to have to decide whether his natural willingness to trust people is becoming a weakness. Rimuru has always wanted to see the best in others, but Yuuki may eventually be the character who forces him to change.

What Is Raphael Really Becoming?

Another question we hope the series explores is Raphael.

Raphael has become much more than a simple ability.

There are moments when Raphael appears to make decisions, withhold information, and analyze situations in ways that feel increasingly independent. The relationship between Rimuru and Raphael is one of the most fascinating parts of the series because Rimuru relies on Raphael for almost everything.

But what exactly is Raphael becoming?

How much independence does Raphael actually have?

Could Raphael eventually make a decision that Rimuru disagrees with?

We do not believe Raphael is secretly evil or planning to betray Rimuru. However, the series continues giving Raphael characteristics that feel more personal and intelligent.

There is clearly something developing there, and we hope the second half of Season 4 begins exploring it.

How Powerful Is Tempest Really?

This may be the biggest question in the entire series.

Rimuru is powerful.

Diablo is terrifying.

Benimaru continues growing.

Shion is basically a walking problem.

Veldora is Veldora.

Then you start looking at the rest of Rimuru’s forces and realize Tempest may already have one of the strongest collections of fighters in the world.

So who can realistically stop them?

That is the challenge the series will have moving forward.

An overpowered main character is fun until there is no longer any real threat. That Time I Got Reincarnated as a Slime needs to introduce conflicts where Rimuru cannot simply show up, let Raphael analyze the situation, and destroy the enemy.

We need consequences.

We need an enemy that understands Rimuru.

More importantly, we need someone who understands his weaknesses.

Rimuru’s biggest weakness has never been his fighting ability. His weakness is the people he loves and his desire to protect everyone.

A smart enemy will eventually understand that.

The Second Half Has the Potential to Be Huge

The first half of Season 4 feels like the series positioning pieces on a massive chessboard.

Tempest continues to grow.

Rimuru’s influence is spreading.

Enemies are watching.

Allies are becoming more powerful.

Yuuki remains a question mark.

Raphael continues to evolve.

And somewhere in the middle of everything is Rimuru, still trying to create a peaceful world while becoming powerful enough to completely change it.

We are enjoying this season because it feels like That Time I Got Reincarnated as a Slime is finally preparing to move into a much larger story.

The series is no longer about whether Rimuru can build a nation.

He already did that.

The question now is whether the rest of the world is willing to accept the nation he built.

We also want answers about Yuuki’s true intentions, Raphael’s continued evolution, the real limits of Rimuru’s power, and whether Tempest will finally face an enemy capable of causing permanent damage.

Because eventually, someone has to push Rimuru too far.

And when that happens, we may finally see what a true Demon Lord Rimuru looks like when diplomacy is no longer an option.

The first half of Season 4 has been a strong continuation of Rimuru’s journey. The world is expanding, the political conflicts feel more important, and the unanswered questions are setting up what could be an incredible second half.

Now we just need the series to deliver on everything it is building.

Because if the second half gives us the answers and battles we are expecting, this could become one of the best seasons of That Time I Got Reincarnated as a Slime yet.