by The official synopsis and preview images for Episode 89 of That Time I Got Reincarnated as a Slime Season 4 have been released. Titled “The Land of Convergence, Ruberios,” the upcoming episode sets the stage for one of the series’ biggest turning points as Demon Lord Leon, Granbell Rosso, and several major factions converge on the Holy Empire of Ruberios.
With war looming and political tensions escalating, Episode 89 promises to deliver intense action, strategic alliances, and major developments that will shape the future of the series.
Season 4 Enters a New Phase
Following the success of the Founding Festival, the Jura Tempest Federation has strengthened its diplomatic ties with neighboring nations. It continues working toward Rimuru Tempest’s vision of creating a world where humans and monsters can coexist peacefully.
However, Tempest’s rapid rise has also attracted powerful enemies.
Several influential leaders now see Demon Lord Rimuru as a threat to the world’s balance, and hidden conspiracies are beginning to unfold behind the scenes. Episode 89 marks the beginning of a large-scale conflict that will test Rimuru’s leadership and the alliances he has built.
Episode 89: “The Land of Convergence, Ruberios” – Official Synopsis
While continuing his search for Chloe, Demon Lord Leon Cromwell requests assistance from Empress Elmesia of the Sorcerous Dynasty of Sarion before traveling to the Holy Empire of Ruberios.
However, by the time Leon arrives, the situation has already become critical.
The forces led by Granbell Rosso have begun preparing for an attack on Ruberios, threatening to plunge the holy nation into chaos before Leon can complete his mission.
As powerful individuals from different factions gather in one place, the balance of power across the continent begins to shift dramatically.
Ruberios Becomes the Center of the Story
Episode 89 shifts the focus to Ruberios, one of the most important human nations in the world of That Time I Got Reincarnated as a Slime.
As the headquarters of the Western Holy Church, Ruberios plays a key role in maintaining political and religious influence throughout the continent. With Leon arriving, Granbell preparing his offensive, and multiple factions pursuing their own agendas, Ruberios becomes the central battlefield for the next major story arc.
Fans can expect a blend of political intrigue, military strategy, and high-stakes confrontations as tensions continue to rise.
Granbell Rosso’s Plot Reaches Its Next Stage
Former Hero Granbell Rosso, leader of the Five Elders, has been secretly orchestrating events from the shadows throughout Season 4.
Believing that Rimuru’s growing influence threatens humanity, Granbell is determined to stop Tempest before its ideals spread further across the world.
Together with his granddaughter Mariabell Rosso, he has manipulated political events behind the scenes, and Episode 89 signals that his long-term strategy is finally entering its decisive phase.
Leon Continues His Search for Chloe
Another major storyline centers on Leon Cromwell, whose search for Chloe O’Bell remains one of the series’ biggest mysteries.
Unlike Granbell, Leon’s motives are deeply personal rather than political. His decision to seek help from Empress Elmesia highlights the importance of his mission and hints that Chloe’s whereabouts may be connected to even larger secrets surrounding the world’s history.
As Leon arrives in Ruberios, viewers can expect new revelations about his past and his connection to Chloe.
What Has Happened So Far?
Since becoming a Demon Lord, Rimuru Tempest has transformed the Jura Tempest Federation into one of the world’s most prosperous nations.
His vision of peaceful coexistence between humans and monsters has earned him many allies, but it has also drawn the attention of rulers who fear Tempest’s growing power.
Season 4 expands the story beyond Tempest itself, exploring international politics, religious conflicts, and the ambitions of powerful kingdoms and Demon Lords.
Why Episode 89 Matters
Episode 89 serves as the opening chapter of a major new conflict that will influence the remainder of Season 4.
Key highlights include:
- Leon Cromwell’s arrival in Ruberios.
- Granbell Rosso’s army preparing for battle.
- The ongoing search for Chloe.
- Rising political tension between major world powers.
- The beginning of a large-scale confrontation involving heroes, Demon Lords, and powerful kingdoms.
The episode lays the foundation for future battles while continuing to expand the rich world-building that has made That Time I Got Reincarnated as a Slime one of the most popular modern fantasy anime.
Main Voice Cast
The series continues to feature an outstanding cast of voice actors, including:
- Miho Okasaki as Rimuru Tempest
- Jun Fukuyama as Leon Cromwell
- Daisuke Ono as Granbell Rosso
- Inori Minase as Mariabell Rosso
- Megumi Toyoguchi as Raphael
- Tomoaki Maeno as Veldora
- Makoto Furukawa as Benimaru
- Sayaka Senbongi as Shuna
- M・A・O as Shion
- Takuya Eguchi as Souei
- Lynn as Luminous Valentine
- Manami Numakura as Hinata Sakaguchi
Production Staff
Season 4 continues to be produced by the experienced team behind previous seasons.
Original Work: Fuse, Taiki Kawakami, and Mitz Vah
Director: Naokatsu Tsuda
Assistant Director: Kenji Yasuda
Series Composition: Hitomi Ogawa
Character Design: Ryoma Ebata
Animation Studio: Eight Bit
Music: R・O・N
The series maintains its signature combination of polished animation, large-scale action sequences, and detailed fantasy world-building.
Broadcast Information
Episode 89: “The Land of Convergence, Ruberios”
Broadcast Date: Friday, August 7, 2026
The episode will air on 30 Nippon TV network stations, BS11, and other regional broadcasters across Japan before becoming available on multiple streaming platforms.
What to Expect Next
With multiple storylines finally converging, Episode 89 is expected to kick off one of Season 4’s biggest arcs.
Viewers can look forward to:
- Political negotiations between powerful nations.
- Leon’s continued search for Chloe.
- Granbell’s military campaign.
- New alliances and betrayals.
- The next major challenge facing Rimuru and Tempest.
As the world edges closer to war, every decision made by its leaders could determine the future of humans, monsters, and Demon Lords alike.
Final Thoughts
Episode 89, “The Land of Convergence, Ruberios,” promises to be one of the most important episodes of That Time I Got Reincarnated as a Slime Season 4. With Granbell Rosso preparing for battle, Leon Cromwell arriving in Ruberios, and multiple powerful factions pursuing their own agendas, the series is entering an exciting new chapter filled with political intrigue, strategic warfare, and emotional storytelling.
Whether you’re a long-time fan or a newcomer catching up on the latest season, Episode 89 is shaping up to be a must-watch installment that lays the groundwork for the dramatic battles and revelations still to come.
