That Time I Got Reincarnated as a Slime — Season 4
24 episodesFirst aired 3 April 2026
Demon Lord Rimuru's dream of creating an alliance between humans and monsters takes a step closer to being realized. As Tempest continues to prosper, Granville Rozzo and his granddaughter, Maribel Rozzo, clash with Demon Lord Rimuru over their plan to protect mankind by ruling over them. Meanwhile, in El Dorado, Demon Lord Leon works toward goals of his own. The awakening of a new Hero draws near!
E1New Days
9.1Apr 202624m
Tempest is thriving after the success of its festival, but unexpected trouble has arisen with the new dungeon.
E2The Dungeon Evolves
8.8Apr 202624m
Rimuru and his trusted companions discuss ideas for improving the dungeon.
E3The Avatar Team Is Formed
7.9Apr 202624m
Rimuru, Ramiris, Veldora, and Milim work on perfecting their avatars before facing Team Green Fury.
E4Invitation
8.0Apr 202624m
The Council of the West deliberates on whether to grant membership to Tempest.
E5The First Step
8.0May 202624m
Rimuru attends the meeting that will determine Tempest's membership in the Council of the West.
E6The Council of the West
8.3May 202624m
A list of unreasonable demands from the Council makes Rimuru realize that a deeper plot is in motion.
E7The Mastermind's Identity
8.3May 202624m
An interrogation of Prince Elric's would-be shooter reveals who's pulling the strings behind the Council.
E8The Groundwork of Greed
7.6May 202624m
Glenda reveals all she knows about the Council and the Rozzos, and Rimuru prepares to inspect ancient ruins.
E9Investigating the Ruins
8.4Jun 202624m
The investigation of the ancient ruins of Amrita begins.
E10The Master of Greed
8.2Jun 202624m
Rimuru and Mirabel come face-to-face at last in the ancient ruins.
E11Milim's Friend
9.2Jun 202624m
Rimuru helps Milim confront the Chaos Dragon, a corrupted form of the baby dragon that was once her friend.
E12Tempest Evolves
7.2Jun 202624m
Rimuru shares his plans for Tempest's future, including a new system of government and Council representation.
E13New Companions
6.5Jul 202624m
Ramiris and Veldora are feeling overworked, so they ask Rimuru to find assistants for them.
E14The Black Numbers
7.5Jul 202624m
Diablo returns with new demon subordinates to add to Tempest's ranks.
E15An Unsettling Feeling
7.0Jul 202624m
As Tempest continues to grow and evolve, the Moderate Harlequin Alliance approaches Demon Lord Leon.
E16Gran, the Hero of Dawn
8.0Jul 202624m
Luminus meets with Rimuru to discuss Gran and future plans.
E17Lubelius, the Point of Convergence
8.0Aug 202624m
While Leon seeks Elmesia's help in finding Chloe, Granville's forces invade Lubelius.
E18Turbulence in the West
Airs Aug 2026Not yet aired
E19Episode 19
Airs Aug 2026Not yet aired
- E20
Episode 20
Airs Aug 2026Not yet aired
- E21
Episode 21
Airs Sept 2026Not yet aired
- E22
Episode 22
Airs Sept 2026Not yet aired
- E23
Episode 23
Airs Sept 2026Not yet aired
- E24
Episode 24
Airs Sept 2026Not yet aired
