The popular isekai anime That Time I Got Reincarnated as a Slime is moving forward with its fourth season. Episode 15 is set to arrive this week, continuing the story of Rimuru Tempest and his growing nation of Tempest. The series has been airing weekly since April 2026, and fans are eager to see what happens next after the dramatic events of Episode 14.
Episode 15 Release Date and Time
That Time I Got Reincarnated as a Slime Season 4 Episode 15 releases on July 17, 2026. The show follows a weekly schedule, with new episodes coming out every Friday.
The episode first airs in Japan on NTV’s “Friday Anime Night” block at 11:00 PM JST. International viewers can watch it on streaming platforms the same day. Here are the release times for different regions around the world:
- Pacific Time (PDT): 8:00 AM
- Central Time (CDT): 10:00 AM
- Eastern Time (EDT): 11:00 AM
- British Summer Time (BST): 4:00 PM
- Central European Summer Time (CEST): 5:00 PM
- India Standard Time (IST): 8:30 PM
- Japan Standard Time (JST): 12:00 AM (July 18)
Where to Watch Episode 15
Fans can stream That Time I Got Reincarnated as a Slime Season 4 Episode 15 on Crunchyroll and Netflix. Crunchyroll streams the episodes weekly as they air in Japan, making it the primary platform for international viewers. Netflix also carries the series in select regions.
Recap of Season 4 Episode 14
Episode 14 focused on Diablo going on a mission to recruit three Primordial Demons: Testarossa (White) , Ultima (Violet) , and Carrera (Yellow) . These demons are incredibly powerful, and bringing them into Rimuru’s service would make Tempest much stronger.
Diablo used different methods to convince each demon to come meet Rimuru. He adjusted his approach based on their personalities. When the three demons finally met Rimuru, they agreed to work with him without much hesitation.
The big moment came when Rimuru gave them new bodies and names. This act made them evolve into Demon Peers. By the end of the episode, Tempest had become home to one of the strongest military forces in the world.
What Episode 15 Could Bring
The previous episode ended with Tempest gaining three powerful new allies. Episode 15 will likely show what happens next after this major development.
The newly recruited Primordial Demons now have physical bodies and names. Fans may finally see the Black Numbers organized into an elite military unit. Diablo, Testarossa, Ultima, and Carrera will probably start assigning roles to their followers and getting used to life in Tempest.
Rimuru might also start to understand just how strong his new army really is. In Episode 14, he named the Primordials without fully realizing how dangerous they are. Episode 15 could show advisors like Benimaru or Raphael explaining to him exactly how much Tempest’s military power has grown.
Other demon lords and kingdoms may also start paying attention to Tempest’s growing strength. The sudden rise of such a powerful military force could change the balance of power in the world.
Season 4 Overview
Season 4 of That Time I Got Reincarnated as a Slime premiered on April 3, 2026. The season is set to run for five cours (about 15 months of TV episodes), with the first two cours airing back-to-back without breaks.
The first 24 episodes follow a weekly release pattern. Episode 5 was delayed from its original May 1 date to May 8 due to scheduling reasons. The full schedule for the remaining episodes is as follows:
- Episode 13 – July 3
- Episode 14 – July 10
- Episode 15 – July 17
- Episode 16 – July 24
- Episode 17 – July 31
- Episode 18 – August 7
- Episode 19 – August 14
- Episode 20 – August 21
- Episode 21 – August 28
- Episode 22 – September 4
- Episode 23 – September 11
- Episode 24 – September 18
The Story So Far
That Time I Got Reincarnated as a Slime follows Rimuru Tempest, a regular guy who died and came back as a powerful slime monster in a fantasy world. He built the nation of Tempest, where monsters and humans try to live together in peace.
Season 4 continues after the big festival. Tempest is growing quickly, but new problems keep showing up. A new enemy named Granville Rozzo and his granddaughter Maribel Rozzo want to control humans to protect them. This puts them on a collision course with Rimuru. At the same time, other powerful demon lords like Leon are working on their own secret plans. Season 4 sees Rimuru’s dream of uniting humans and monsters move closer to reality as Tempest continues to thrive.
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Why Fans Are Excited
The recruitment of the Primordial Demons in Episode 14 was a major turning point for the series. These three demons are among the most powerful beings in the world, and having them on Rimuru’s side changes everything. Fans are curious to see how the new characters will fit into the story and what kind of impact they will have on Tempest’s future.
The series has stayed one of the most closely watched isekai anime currently airing. The shift into political tension surrounding the Rosso family has kept the narrative moving at a steady pace heading into this stretch of episodes.
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