That Time I Got Reincarnated as a Slime Season 4 Episode 4: Invitation

On the 35th floor, veteran adventurers face a sudden, merciless end. A swift red slime, Scarlet, takes one life instantly, followed by Blue Death's scythe eliminating the mages. Mauve Titan and Goldskull finish the remaining fighters without mercy. Their bodies dissolve, a grim announcement confirming their defeat. It is a brutal spectacle, designed to impress and intimidate, a clear demonstration of the dungeon's lethality.

Inside the boss chamber, the fierce monsters drop their act, celebrating their easy victory like actors after a play. Goldskull laughs at the 'trash' adventurers, while his colleagues discuss their performance. It is a revealing moment, showing these terrifying beings are, in fact, employees, playing a role in a carefully constructed game. Outside, Tempest thrives, with adventurers spending freely, drawn by the allure of the dungeon and its televised boss fights. Masayuki and his party, already on the 50th floor, exemplify the competitive spirit Rimuru has ignited.

A relaxed Rimuru, Milim, and Veldora chat casually about the dungeon's need for tougher challengers, their banter light and free. Their playful mood is abruptly shattered by Shuna's arrival, her smile polite but chilling. She announces a guest, and Milim visibly recoils. The guest is Frey, who has come to retrieve a terrified Milim, exposing her abandonment of administrative duties. Frey drags Milim away for a 'private talk,' leaving Rimuru and Veldora relieved to be spared Shuna's and Frey's wrath. Shuna then turns her unnerving focus on Rimuru, demanding an explanation for his own 'research' in the dungeon, making him sweat under her intense gaze.

The tense atmosphere of Shuna's interrogation is broken by Mjöllmile, who bursts in with a long-awaited letter from the Council of the West. Rimuru accepts this distraction with relief, though Shuna's suspicion lingers. The letter signals a grave shift from internal affairs to the broader political stage. Rimuru retreats to consider its implications, understanding the political landscape has changed since the Seven Days Clergy's defeat. Raphael provides meticulous intelligence on the Council's members, revealing the hidden work done behind the scenes. Rimuru acknowledges that even while he was distracted, his own skill was diligently preparing for the coming diplomatic challenges.

A new player emerges: Mariabell Rosso, a young girl surrounded by maps and financial documents. Her monologue explains her philosophy: true power isn't brute strength, but control over the world's underlying systems—its economy, its laws. She views Rimuru's rising influence as a direct challenge to her family's long-held dominance. Her calm, calculating demeanor suggests a formidable, unseen opponent who understands the levers of true global power.

In the grand hall of Ingrassia, the Council of the West convenes to decide the fate of the Jura Tempest Federation. Hinata Sakaguchi observes silently as delegates like Gaban voice skepticism about a nation of monsters. Other members, including Johann, argue for Tempest's recognition, citing reduced monster attacks in their territories. Hinata confirms Rimuru's rational nature, but the deep-seated fear of Veldora's presence remains a significant hurdle. The debate is heated, reflecting the deep divisions and prejudices within the human nations.

The tense debate shifts dramatically when Delegate Rostia reveals alarming intelligence: the Eastern Empire is mobilizing its forces, posing a clear and present danger. This news injects a stark urgency into the proceedings. Rostia argues that Tempest's formidable military, including a Demon Lord and a True Dragon, is essential as a shield against this impending invasion. The strategic necessity overwhelms prior prejudices. The Council votes, accepting the Jura Tempest Federation as an ally by an overwhelming majority, driven by the immediate threat.

After the vote, Prince Elrick of Ingrassia confronts Hinata, arrogantly stating his intent to provoke Rimuru at the upcoming summit. He demands Hinata and her knights serve as his bodyguards. Hinata refuses his petty demands, reminding him of the non-aggression pact and the foolishness of his plan, leaving him seething. Later, walking alone, Hinata questions the suspicious timing of the Eastern Empire's reveal. She suspects a hidden hand manipulated the council, pushing Tempest into a larger, more dangerous geopolitical game, a pawn in a game she does not yet fully comprehend.

Back in Tempest, preparations for the diplomatic mission are complete. Shion is distraught, tearfully begging Rimuru to take her along. Rimuru sternly, but with a clear affection, explains that her role as 'First Secretary' to maintain order in the capital is paramount. His trust fills Shion with a new, determined resolve. With their duties clear, Rimuru, Benimaru, Souei, and Shuna step onto a glowing teleportation circle, vanishing in a pillar of light as they embark on their historic journey to meet the Western Nations.