That Time I Got Reincarnated as a Slime Season 4 has released a new promotional trailer and key visual ahead of the beginning of its second cour on July 3, 2026.
The latest materials preview a darker and more dangerous stage of Rimuru Tempest’s story, placing greater emphasis on the conflict involving Granbell Rosso, Chloe, Demon Lord Leon Cromwell and several mysterious figures connected to the concept of a Hero.
The announcement also revealed the second opening and ending theme songs for Season 4. Daoko will perform the new opening, titled “TACTIC,” while Azusa Tadokoro, the Japanese voice actress behind Chloe, will perform the ending theme “Hymnal.”
Tensura Season 4 Cour 2 Begins on July 3
The second cour of That Time I Got Reincarnated as a Slime Season 4 will begin airing in Japan on July 3, 2026.
The anime continues to air through Nippon TV’s Friday Anime Night programming block, with new episodes broadcast every Friday at 11:00 p.m. JST across the network’s national affiliates.
BS11 also broadcasts the season every Saturday at 10:00 p.m. JST.
- Second cour premiere: July 3, 2026
- Main Japanese broadcast: Nippon TV network
- Broadcast time: Fridays at 11:00 p.m. JST
- BS11 broadcast: Saturdays at 10:00 p.m. JST
- Total Season 4 structure: Five split cours
- Animation production: Eight Bit
Season 4 began on April 3, 2026. Its first and second cours are being aired consecutively, allowing the story to continue through the summer season without a break between the two parts.
Season 4 Will Be Told Across Five Cours
The fourth season is the most ambitious television project in the history of the Tensura franchise.
Instead of following the standard one-cour or two-cour structure used by most modern anime, Season 4 was announced as a production divided across a total of five cours.
The first two are airing consecutively beginning in April 2026. The broadcast schedules for the remaining three cours have not yet been fully detailed.
This extended format gives the adaptation considerably more time to explore the political conflicts, historical revelations and character relationships that become increasingly important after Rimuru establishes Tempest as a recognized nation.
The second cour is therefore not the conclusion of Season 4. It represents another stage in a much larger narrative that will continue across future installments.
The New Trailer Previews a Darker Conflict
The second promotional trailer shifts the tone away from the celebration and diplomatic progress surrounding Tempest’s Founding Festival.
Rimuru’s nation has become stronger, wealthier and more influential, but that success has also attracted the attention of powerful individuals who consider the rise of a monster-led country a threat to humanity.
The trailer presents a conflict in which diplomacy, manipulation and personal history are as important as physical strength.
Granbell Rosso continues moving against Rimuru while claiming that his actions are necessary to protect humankind. His plans place Tempest in direct opposition to people who believe coexistence between humans and monsters is either impossible or too dangerous to permit.
The footage also places significant attention on Chloe and the mystery surrounding the awakening of a Hero.
As different objectives collide, Rimuru must confront opponents who cannot be defeated simply by demonstrating Tempest’s peaceful intentions.
The Second Key Visual Introduces Major New Figures
A second key visual was released alongside the trailer, gathering several of the characters expected to shape the new cour.
Rimuru appears at the center, surrounded by allies, enemies and mysterious figures whose roles in the conflict have not yet been completely explained in the anime.
The visual prominently features Testarossa, Ultima and Carrera, three Primordial Demons who are finally preparing to take on more substantial roles in the television series.
Chloe and Granbell also appear in the foreground. Between them is a mysterious character whose appearance strongly resembles Chloe, increasing the importance of the questions surrounding her identity and connection to the Hero mentioned in the season’s storyline.
The composition suggests that the second cour will connect the political conflict involving the Rosso family with much older events and supernatural forces.
Testarossa, Ultima and Carrera Enter the Main Story
The appearance of Testarossa, Ultima and Carrera is one of the most significant elements of the new visual.
All three belong to the extremely rare and powerful group known as the Primordial Demons.
Primordials are not ordinary members of the demon race. They have existed since ancient times and possess experience and power far beyond most magical beings.
Diablo, one of Rimuru’s most loyal subordinates, is also a Primordial. His devotion to Rimuru has already demonstrated how dangerous one of these demons can become when given freedom and a clear purpose.
The arrival of three additional Primordials dramatically increases Tempest’s potential power, but it also creates new complications. These individuals possess strong personalities, enormous pride and histories that extend far beyond Rimuru’s lifetime.
Their inclusion signals that Rimuru’s nation is entering a level of international and supernatural influence that would have seemed impossible during the beginning of the series.
Daoko Performs the New Opening Theme “TACTIC”
The second opening theme for Season 4 is titled “TACTIC” and is performed by Daoko.
The song accompanies the darker and more tense atmosphere of the upcoming storyline while maintaining a fast, energetic sound.
Daoko explained that the track was designed to reflect the increasingly dangerous world surrounding Rimuru while still delivering a distinctive high-energy performance.
The music was created with contributions from Giga and TeddyLoid, two artists known for electronic productions with intense rhythm and strong digital textures.
Daoko also emphasized that the lyrics are connected to the events of the story, encouraging viewers to consider their meaning alongside the anime.
- Second opening theme: “TACTIC”
- Performer: Daoko
- Musical contributors: Giga and TeddyLoid
“TACTIC” Reflects the New Political Battle
The title “TACTIC” is particularly appropriate for this stage of the series.
Rimuru has faced many powerful enemies, but the threats surrounding Tempest are becoming increasingly strategic.
Granbell and Mariabell Rosso do not rely only on direct combat. They use political influence, economic power, social fear and manipulation to weaken their enemies.
Rimuru must therefore think beyond battlefield strength. Every alliance, public decision and diplomatic relationship may become part of a much larger confrontation.
The song’s energetic sound and story-linked lyrics are expected to reinforce the feeling that multiple plans are unfolding simultaneously.
Azusa Tadokoro Performs the New Ending Theme
The second ending theme is titled “Hymnal” and is performed by Azusa Tadokoro.
Tadokoro has a particularly close connection to the new storyline because she also voices Chloe Aubert in the Japanese version of the anime.
“Hymnal” was created around Chloe’s emotions, especially her desire for reunion, her refusal to abandon hope and the powerful love she continues carrying through unimaginable circumstances.
Tadokoro described the song as both an expression of Chloe’s strength and a prayer connected to the extraordinary days ahead of her.
- Second ending theme: “Hymnal”
- Performer: Azusa Tadokoro
- Digital release: July 4, 2026
- Character connection: Tadokoro voices Chloe Aubert
The song will be released digitally on July 4, one day after the beginning of the second cour.
Chloe Becomes Central to the New Cour
Chloe has appeared throughout the series as one of the children rescued and taught by Rimuru, but the new materials indicate that her role is about to become considerably more important.
Her connection to spirits, Heroes and events beyond the ordinary flow of time has been suggested through earlier seasons.
The second visual places her directly beside Granbell and the mysterious figure who resembles her, making it clear that the story surrounding Chloe is entering a decisive phase.
The choice of her voice actress to perform the ending theme further strengthens that focus.
Instead of using a song unrelated to the characters, “Hymnal” was developed specifically around Chloe’s feelings, hopes and determination.
The ending sequence is therefore expected to provide a more emotional perspective on events that may otherwise be dominated by political conflict and large-scale battles.
Granbell Rosso Sees Rimuru as a Threat
Granbell Rosso is the former Hero who leads the Five Great Elders of the Kingdom of Siltrosso.
He believes that humanity must be protected through control. From his perspective, the rapid rise of Rimuru and the Jura Tempest Federation represents a danger that cannot be ignored.
Tempest promotes cooperation between humans and monsters, but Granbell does not share Rimuru’s confidence in peaceful coexistence.
His position is especially dangerous because he does not see himself as a villain. He believes his decisions are justified by the need to preserve humanity.
That conviction makes negotiation extremely difficult. Rimuru cannot simply prove that Tempest has peaceful intentions when Granbell views its very existence as an unacceptable risk.
Mariabell Rosso Uses Greed as a Weapon
Granbell’s granddaughter, Mariabell Rosso, has already become one of the main enemies of Season 4.
She possesses the Unique Skill Greed, an ability connected to desire, manipulation and control.
Mariabell understands that Tempest cannot be destroyed easily through military force. Rimuru’s nation has powerful fighters, advanced technology and alliances with several influential countries.
Instead, she attempts to attack its political and economic foundations.
Her strategy demonstrates how much the series has changed. Earlier enemies frequently confronted Rimuru in direct battles, but the Rosso family uses institutions and human ambition as weapons.
Defeating that type of opponent requires more than destructive magic.
Demon Lord Leon Continues Pursuing His Own Objective
The new storyline also places renewed attention on Leon Cromwell, the Demon Lord who rules the Golden Land of El Dorado.
Leon has been connected to several mysteries since the earliest stages of the anime.
Shizue Izawa was summoned into the world under circumstances involving Leon, and his name has repeatedly appeared in connection with summoned children and powerful spirits.
Although he is frequently treated as a dangerous or emotionally distant figure, Leon’s actions are driven by a personal objective that has not yet been completely explained in the anime.
As the story surrounding Chloe develops, Leon’s motivations and past become increasingly relevant.
The second cour places him within a conflict where Heroes, Demon Lords and ancient relationships begin converging.
The Story of an Awakening Hero Begins
The official synopsis for Season 4 repeatedly refers to the awakening of a Hero.
Heroes occupy a special position within the world of Tensura. They are traditionally viewed as protectors of humanity and natural opponents of Demon Lords.
However, the series has increasingly demonstrated that those titles do not automatically determine whether someone is morally right.
Rimuru is a Demon Lord who wants to create a peaceful multinational society. Granbell is a former Hero who believes control and manipulation are necessary to save humanity.
The conflict therefore challenges the traditional assumption that Heroes represent good while Demon Lords represent evil.
The awakening mentioned in the synopsis is expected to place those ideas at the center of the second cour.
Tempest’s Success Creates New Enemies
Rimuru’s original goal was to create a safe home where monsters could live without persecution.
That settlement has now become the powerful Jura Tempest Federation, a nation with growing diplomatic, military and economic importance.
The Founding Festival allowed Rimuru to establish formal relationships with leaders, merchants and influential representatives from several countries.
Those developments bring Rimuru closer to his dream of creating a world where humans and monsters can prosper together.
However, Tempest’s success threatens existing systems of power.
Countries and organizations that benefited from division, fear and economic control now have reasons to oppose Rimuru, even when they cannot publicly attack his ideals.
Rimuru Must Balance Diplomacy and Power
Rimuru possesses overwhelming abilities, but using them carelessly could destroy the international trust he has worked to establish.
If Tempest responds to every act of hostility with military force, its enemies can portray the nation as proof that monsters are dangerous.
Rimuru must protect his people without allowing opponents to control the public narrative.
This challenge places greater importance on characters such as Diablo, Benimaru, Testarossa and the other leaders responsible for diplomacy, intelligence and national defense.
The second cour is expected to show how Tempest operates when facing coordinated enemies who understand that Rimuru’s reputation is almost as important as his combat strength.
Season 4’s First Theme Songs
The first cour of Season 4 used “Esoragoto” by Eir Aoi as its opening theme.
The song accompanied the beginning of Rimuru’s new political struggle and the efforts to transform the success of the Founding Festival into lasting international cooperation.
The first ending theme was “Katsubou” by CiON.
With the arrival of the second cour, “TACTIC” and “Hymnal” will replace those songs, providing a new musical identity for the darker stage of the season.
- First cour opening: “Esoragoto” by Eir Aoi
- First cour ending: “Katsubou” by CiON
- Second cour opening: “TACTIC” by Daoko
- Second cour ending: “Hymnal” by Azusa Tadokoro
Main Japanese Voice Cast
- Miho Okasaki as Rimuru Tempest
- Megumi Toyoguchi as Raphael
- Tomoaki Maeno as Veldora Tempest
- Makoto Furukawa as Benimaru
- Sayaka Senbongi as Shuna
- M.A.O as Shion
- Takuya Eguchi as Soei
- Hochu Otsuka as Hakuro
- Asuna Tomari as Gobta
- Chikahiro Kobayashi as Ranga
- Rina Hidaka as Milim Nava
- Anzu Haruno as Ramiris
- Takahiro Sakurai as Diablo
- Lynn as Luminous Valentine
- Manami Numakura as Hinata Sakaguchi
- Yoshitsugu Matsuoka as Masayuki
- Daisuke Ono as Granbell Rosso
- Inori Minase as Mariabell Rosso
- Natsuki Hanae as Yuuki Kagurazaka
- Azusa Tadokoro as Chloe Aubert
The Main Production Team Returns
Season 4 continues to be animated by Eight Bit, the studio responsible for the main television adaptation since the beginning of the franchise.
Atsushi Nakayama directs the season, with Hitomi Ogawa handling series composition.
Ryoma Ebata is responsible for character designs, while R・O・N composes the music.
- Original story: Fuse
- Original character concepts: Mitz Vah
- Manga adaptation: Taiki Kawakami
- Director: Atsushi Nakayama
- Series composition: Hitomi Ogawa
- Character design: Ryoma Ebata
- Music: R・O・N
- Animation production: Eight Bit
What Is That Time I Got Reincarnated as a Slime About?
That Time I Got Reincarnated as a Slime begins when Japanese office worker Satoru Mikami is killed and reincarnated in a fantasy world.
Instead of receiving a powerful human body, he becomes a slime, a creature generally considered weak and insignificant.
His new abilities allow him to absorb materials, creatures and magical powers. After meeting the imprisoned dragon Veldora, he receives the name Rimuru Tempest.
Rimuru gradually builds relationships with goblins, ogres, dwarves, lizardmen and many other races.
What begins as a small village develops into the Jura Tempest Federation, a country founded on the belief that humans and monsters should be able to live together.
Rimuru eventually becomes a True Demon Lord, gaining enough power to protect his citizens while also becoming an important figure in international politics.
Why the Second Cour Is Important
The second cour arrives at a turning point for Rimuru and Tempest.
The nation has survived invasions, assassination attempts and conflicts with other Demon Lords. Its greatest challenges are no longer limited to physical survival.
Rimuru must now defend the idea behind Tempest.
Granbell and Mariabell represent a worldview in which humanity can only remain safe through domination and strict control.
Rimuru represents coexistence, voluntary cooperation and the possibility of building prosperity across racial divisions.
The conflict between them is therefore ideological as well as political.
At the same time, the mysteries involving Chloe, Leon and the awakening Hero connect the present battle to events with much deeper historical consequences.
What to Expect From Tensura Season 4 Cour 2
The new trailer suggests that viewers can expect a combination of political maneuvering, magical battles and important revelations about characters who have remained mysterious for several seasons.
Testarossa, Ultima and Carrera will expand Tempest’s already powerful group of allies, while Granbell and Mariabell continue placing pressure on Rimuru’s vision for the future.
Chloe’s connection to the Hero storyline is expected to become increasingly important, and Leon’s actions may finally clarify mysteries established much earlier in the anime.
The transition from “Esoragoto” and “Katsubou” to “TACTIC” and “Hymnal” also reflects the changing tone of the season.
The first cour focused on the consequences of Tempest’s expansion. The second appears ready to confront the powerful forces determined to stop that expansion before Rimuru’s ideal world can become a reality.
Final Thoughts
That Time I Got Reincarnated as a Slime Season 4 begins its second cour on July 3, 2026, continuing the first two parts of the season without an interruption.
The new trailer and key visual introduce a darker stage of Rimuru’s conflict, highlighting Granbell, Chloe, the mysterious Hero storyline and the arrival of the Primordial Demons Testarossa, Ultima and Carrera.
Daoko will perform the new opening theme, “TACTIC,” a high-energy song created to reflect the tense atmosphere of the story.
Azusa Tadokoro will perform “Hymnal,” an ending theme inspired by Chloe’s hope, love and desire for reunion.
With Tempest facing enemies who use politics, manipulation and ancient power rather than relying only on direct combat, the second cour promises to push Rimuru into one of the most complex battles of his journey so far.
