Welcome to Demon School, Iruma-kun Season 4 Episode 23 takes a quieter but very important turn as Iruma starts thinking seriously about what it means to become the Demon King. Instead of another large battle or school event, the episode focuses on Sabro, his family, and the growing question of who could eventually take the Demon King’s throne.
The episode, titled “The Road to the Demon King,” also gives us a closer look at Sabro’s childhood dream and shows how much his time with Iruma has changed the way he thinks about that dream. The biggest surprise comes when Baal, one of the Thirteen Crowns and Sabro’s uncle, offers to help make Sabro a candidate for Demon King.
But Sabro does not simply accept the offer. His answer becomes one of the most important character moments of the episode.
What Happens in Welcome to Demon School, Iruma-kun Season 4 Episode 23?
The episode begins with Iruma thinking about the future and the position of Demon King. After everything that has happened to him in the Netherworld, Iruma has started taking the idea of becoming Demon King more seriously.
He decides that if he wants to understand the Demon King and what the position really means, he needs to learn more about its history. This leads him to Sabro, who has been fascinated by Demon Kings for a very long time.
| Information | Details |
|---|---|
| Anime | Welcome to Demon School, Iruma-kun |
| Season | Season 4 |
| Episode | Episode 23 |
| Episode Title | The Road to the Demon King |
| Japanese Series Title | Mairimashita! Iruma-kun |
| Release Date | September 19, 2026 |
| Main Focus | Iruma, Sabro, the Demon King, and the Sabnock family |
| Important New Character | Sylvia Sabnock |
| Major Reveal | Baal is Sabro’s uncle and wants to support Sabro as a Demon King candidate |
| Ending | Sabro rejects Baal’s offer, while Sabzan warns that Sabro cannot become Demon King |
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Iruma Visits the Demon King Battler
Iruma visits the Demon King Battler, where Sabro is surrounded by books, records, and other material about the rulers of the Netherworld. The group is made up of demons who are deeply interested in Demon King history.
For Sabro, this is practically the perfect place. His dream of becoming Demon King has been one of the defining parts of his character since the beginning of the series.
Iruma’s visit also gives Sabro a chance to talk about the Demon King without treating the subject as a simple fantasy. Iruma wants to understand what the position means and what kind of person should actually hold it.
This conversation is important because Iruma’s own future is now connected to the Demon King question. Sullivan has already suggested that Iruma could potentially follow that path, and the existence of other candidates makes the situation even more complicated.
Sabro’s Sister Sylvia Is Introduced
The story then moves to the Sabnock family home, where Sabro’s younger sister, Sylvia Sabnock, makes an important appearance.
Sylvia has passed the entrance examination for Babyls and will become a student there in the future. Her arrival gives the episode a lighter family moment, but it also expands the Sabnock family and gives us another reason to pay attention to what happens to Sabro.
Sabro’s relationship with Sylvia is much warmer than his relationship with his father. She clearly looks up to her older brother and is excited about his return home.
The family scene also introduces Yamanda, a servant of the Sabnock family, and sets up the arrival of someone much more important.
Baal Is Sabro’s Uncle
The major reveal comes when Baal appears.
Baal is one of the Thirteen Crowns and is known as a powerful demon associated with the southern part of the Netherworld. He is also revealed to be Sabro’s uncle.
This connection explains why Baal and Sabro share a family resemblance and adds another layer to the larger conflict surrounding the Demon King position.
Baal is not simply visiting his family. He has a reason for taking an interest in Sabro’s future.
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Why Does Baal Want Sabro to Become Demon King?
Baal tells Sabro about the Trickster Project, a plan connected to selecting candidates for the next Demon King.
Several possible candidates are already being considered, including Iruma, whose position has become increasingly unusual because of his connection to Sullivan.
Baal then offers Sabro something that sounds almost impossible to refuse: his support in becoming Demon King.
For someone like Sabro, who has wanted the title for years, this should be the opportunity of a lifetime.
But Sabro does not accept.
Why Does Sabro Reject Baal’s Offer?
This is the heart of Episode 23.
Sabro has always wanted to become Demon King, but his understanding of that dream has changed since he entered Babyls and became part of the Misfit Class.
Earlier in the series, Sabro’s idea of becoming Demon King was heavily connected to strength, glory, and proving himself. He admired legendary Demon Kings and wanted to follow their example.
His experiences with Iruma and the other Misfits have slowly changed that outlook.
Sabro now wants to earn his position himself. He does not want to become Demon King simply because a powerful member of his family opened the door for him.
That is why Baal’s offer does not tempt him in the way it might have during Season 1.
Sabro wants the title because he believes he can become worthy of it, not because his family can hand it to him.
How Iruma Changed Sabro
Sabro’s decision makes more sense when we look at his relationship with Iruma.
Sabro originally saw Iruma as a rival. Over time, however, that rivalry developed into genuine respect and friendship.
Iruma has shown Sabro that strength does not always mean standing alone. The Misfit Class repeatedly succeeds because its members work together, protect each other, and accept their differences.
Sabro himself has changed because of those experiences. His role during the previous events involving Lilith’s Carpet showed a much more mature side of him.
He is still proud, ambitious and obsessed with becoming Demon King. The difference is that he now has a clearer idea of what kind of Demon King he wants to be.
This is why Baal’s offer feels wrong to him. Accepting it would make his dream dependent on his family’s influence rather than his own achievements.
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What Does Baal Have to Do With the Six Fingers?
Another reason the scene is important is Baal’s connection to the larger threat surrounding the Netherworld.
Baal has already been connected to Kirio and the organization known as the Six Fingers. Their plans have repeatedly placed Iruma and Babyls in danger.
Because of this connection, Baal’s offer to Sabro cannot be viewed as a simple act of family support.
Sabro does not appear to know everything about Baal’s plans, but his decision keeps him away from a path that could have placed him directly under Baal’s influence.
Why Does Sabzan Say Sabro Cannot Become Demon King?
The episode ends with another major question.
Sabzan, Sabro’s father, makes it clear that he does not believe Sabro can become Demon King. His attitude toward Baal is also extremely cold.
When Baal tries to interfere with Sabro’s future, Sabzan firmly pushes back. The scene suggests that there is a much deeper history between the two brothers than the episode explains.
Sabzan’s statement is especially interesting because Sabro has spent so much of his life believing that becoming Demon King is his destiny.
So why does his own father insist that he cannot do it?
The episode does not provide a complete answer. Instead, it leaves the question hanging for the final episode of the season.
Welcome to Demon School, Iruma-kun Season 4 Episode 23 Ending Explained
The ending is less about whether Sabro will become Demon King and more about how he wants to reach that position.
Baal gives Sabro a shortcut. He has influence, political power, and connections within the Netherworld. Sabro could potentially use that influence to move closer to the throne.
Sabro refuses because doing so would go against the person he has become.
This is also where the episode connects Sabro’s character development with Iruma’s story. Both characters are beginning to think seriously about what the Demon King position represents, but neither is simply chasing the title for its own sake.
For Sabro, the throne must be earned. His rejection of Baal shows that his ambition has become more personal and more principled than it was when he first entered Babyls.
The final exchange with Sabzan then raises another mystery: what happened between Sabzan and Baal, and why is Sabzan so determined to keep Baal away from his family?
Those questions give the season’s final episode another important thread to follow.
What Does Episode 23 Mean for Iruma?
Iruma does not dominate the episode, but his influence is felt throughout it.
His relationship with Sabro has helped change the way Sabro thinks about leadership, friendship, and ambition. That is significant because Iruma has never tried to teach Sabro how to become a better demon. His actions simply gave Sabro a different example to follow.
Iruma’s own connection to the Demon King position is also becoming more serious. Sullivan has given him the option of pursuing that path, while the wider Netherworld is beginning to pay attention to him.
Episode 23 therefore works as a quiet bridge between the events of Season 4 and the larger story that is still developing around Iruma’s future.
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What Happens Next in Welcome to Demon School, Iruma-kun?
Season 4 is scheduled to continue with Episode 24 after Episode 23’s September 19 release. Current episode listings place Episode 24 on September 26, 2026.
With the season approaching its final episode, the story still has several questions to address, especially around Iruma’s future, the Demon King candidates, Baal, and the Sabnock family.
Baal wants to support Sabro as a candidate for the Demon King’s position through the Trickster Project. His proposal would give Sabro a powerful path toward the throne.
Sabro wants to become Demon King through his own efforts. He does not want to rely on Baal’s political influence or receive the position through his family’s connections.
Sylvia is Sabro’s younger sister. Episode 23 reveals that she passed the entrance examination for Babyls and is expected to attend the school.