That Time I Got Reincarnated as a Slime Season 3 Episode 4: Everyone Has a Part to Play

A party of adventurers, confident in their abilities, enters the deeper levels of Jura-Tempest's Underground Labyrinth. They move with practiced caution, but the dungeon's inhabitants prove too swift. The red slime Scarlet ambushes them, followed by the spectral Blue Death, who unleashes a devastating magical attack. The remaining adventurers are quickly overwhelmed by the combined might of the 'Dungeon Dominators'.

The 'Dungeon Dominators'—Scarlet, Blue Death, Mauve Titan, and Goldskull—revel in their easy victory. A montage showcases their individual combat prowess, underscoring why these monsters are so effective. Outside the labyrinth, a bustling town thrives, fueled by the steady stream of adventurers drawn to the challenge. Even the 'Chosen One,' Masayuki, finds accidental fame within this burgeoning economy.

Rimuru, Veldora, and Ramiris watch the dungeon's broadcast, pleased with its popularity, joined by a bored Milim Nava. Their leisure is interrupted when Shuna announces a visitor, her smile hinting at trouble. The former Demon Lord Frey sits in the reception room, exuding calm authority. Milim instantly pales, attempting to hide behind Rimuru, betraying her usual bravado.

Frey confronts Milim about her neglected duties, having found her assigned guards tied up. Milim's excuses fall flat as Frey unceremoniously drags her away for a lecture, much to Rimuru and Veldora's silent relief. However, Shuna quickly catches Rimuru, chiding him with a 'scary' smile for neglecting his administrative duties. He attempts to find an excuse, but Raphael coldly informs him that repentance is the only logical course.

Myourmile rushes in, bearing a formal invitation from the Council of the West for Rimuru to attend their next meeting. The Council seeks to discuss the Jura-Tempest Federation's formal admission as a member nation. Rimuru realizes his prior encounters with the Rosso family's scouts were likely preliminary investigations. He understands that his playful 'dungeon master' persona must now yield to the demands of a 'statesman'.

The true architect behind the Council's economic strategy is revealed to be Mariabell Rosso, a young girl with vacant purple eyes. She meticulously manipulates pieces on a map, explaining her ambition to control the world through economic systems, not brute force. Mariabell views nations and people as mere numbers in her financial schemes. The emergence of Tempest is simply a new variable in her calculated plan for global dominance.

At the grand Council of the West headquarters, representatives from various nations engage in a heated debate about Rimuru and the monster nation. Some fear a Demon Lord's inclusion is madness, while others argue for potential alliance. Hinata Sakaguchi observes the bickering with disdain, internally noting their shortsightedness compared to Tempest's structured discussions. She recognizes their profound misunderstanding of Rimuru's true power, particularly concerning the tamed Storm Dragon Veldora.

The Council's petty arguments are swiftly overshadowed by the revelation of the Eastern Empire's large-scale military exercises near the border. Gavel declares that with the Kingdom of Farmus gone, Tempest is now the only viable shield against an invasion. The fear of the Empire quickly outweighs their fear of Rimuru. Gavel and Johann successfully argue that inviting Tempest will bind them to international law and utilize their power as a deterrent.

Following the unanimous vote to admit Tempest, Hinata Sakaguchi encounters Prince Elric of Ingrassia. He proposes a foolish scheme to 'test' Rimuru at the upcoming meeting, hoping to expose his 'monstrous nature'. Hinata flatly rejects his plan, warning him of the extreme danger in provoking a Demon Lord. She reveals that her rumored 'tie' with Rimuru was a political fabrication, and she is uncertain of victory should they fight again. She implores Elric to abandon his shortsighted machinations.

As Hinata walks through Ingrassia, she reflects on the council meeting and Elric's naivety. A growing unease settles over her; she suspects a hidden hand is manipulating the council from the shadows, perhaps the same force behind Duke Muse's downfall. The Eastern Empire's mobilization now seems to her like another piece of a larger, more intricate plan. Her concerns grow as she senses a deeper political trap unfolding.

Back in Tempest, Rimuru, in his slime form, prepares for the journey to Ingrassia. He cleverly placates an upset Shion by appointing her 'First Secretary' and guardian of Tempest in his absence, ensuring she doesn't cause trouble at the Council meeting. Shuna helps Rimuru don his formal attire, and he gathers his executives—Benimaru, Souei, and Myourmile—in the palace courtyard. They stand within a magic circle, ready for the teleportation that will take them to the heart of human diplomacy.