‘That Time I Got Reincarnated as a Slime’ Season 4 Episode 21 Release Date and Time

Rimuru Tempest’s world keeps expanding, and fans are already counting down to the next chapter of ‘That Time I Got Reincarnated as a Slime’ season 4. The fourth season is expected to feature 60 episodes in total across five cours, with the first two cours airing consecutively for a combined 24 episodes. That momentum has kept the fandom glued to their screens every single week this summer.

With episode 20 having just wrapped up, attention has now shifted to when the next installment of ‘That Time I Got Reincarnated as a Slime’ will actually arrive, and what viewers can expect once Tempest’s political drama picks back up.

‘That Time I Got Reincarnated as a Slime’ Episode 21 Release Date

Episode 21 of ‘That Time I Got Reincarnated as a Slime’ is confirmed to premiere on Friday, September 4, 2026, based on the show’s official episode guide. This follows directly after episode 20, titled Chronoa the Hero Part 1, which is scheduled for August 28, keeping the season on its established weekly rhythm.

The show had previously confirmed a sudden delay, with an episode bumped from its originally scheduled July 31st release to a newly planned launch in August due to broadcast changes in Japan. A recap episode was used to fill that gap, which briefly threw the numbering out of sync with what fans had expected earlier in the run.

Since then, ‘That Time I Got Reincarnated as a Slime’ has settled back into a dependable Friday cadence. That stability has been a welcome shift after a stretch of turbulence earlier in the season, and the show now continues to follow a consistent weekly release once episodes are locked in.

Where to Watch ‘That Time I Got Reincarnated as a Slime’ Season 4?

New episodes of ‘That Time I Got Reincarnated as a Slime’ season 4 release on Fridays at 7 a.m. PT and 10 a.m. ET on Crunchyroll, arriving with English subtitles as well as an English dub. That means international viewers do not have to wait long after the Japanese broadcast to catch up with Rimuru and the rest of Tempest.

Crunchyroll is streaming the season across North America, Central America, South America, Europe, Africa, Oceania, the Middle East, CIS and Southeast Asia. In Japan itself, the anime airs on NTV’s Friday Anime Night programming block, before it becomes available for the global Crunchyroll audience.

For those checking other platforms, streaming trackers have also noted that the season can be found through Crunchyroll’s Amazon Channel, or purchased digitally on services like Amazon Video and Apple TV, though there is currently no free streaming option outside of a Crunchyroll subscription.

Because episodes typically go live in Japan around midnight local time before the Crunchyroll rollout later that day, fans outside Japan should expect the same familiar pattern for episode 21, landing comfortably within the Friday afternoon window for most of Europe and the morning window across North America.

‘That Time I Got Reincarnated as a Slime’ Season 4 Story So Far

The current stretch of ‘That Time I Got Reincarnated as a Slime’ has been building toward the fallout of the Chronoa the Hero arc, with the fandom closely tracking how the political tension around Tempest continues to escalate. Demon Lord Rimuru’s dream of creating an alliance between humans and monsters has taken another step toward becoming reality, even as it draws new enemies out of the shadows.

Granville Rozzo and his granddaughter, Maribel Rozzo, remain at odds with Rimuru, clashing over their belief that mankind must be protected through direct rule rather than coexistence with monsters. That conflict has quietly shaped much of the season’s back half, giving the show a heavier political edge than earlier arcs of ‘That Time I Got Reincarnated as a Slime’.

Meanwhile, Demon Lord Leon continues working toward his own separate goals in El Dorado, and the anime has teased that the awakening of a new Hero is drawing near. With episode 20 already titled around Chronoa the Hero, episode 21 is expected to carry that storyline into its next phase, likely deepening the standoff between Tempest and its rivals.

‘That Time I Got Reincarnated as a Slime’ Episode Count and Season Structure

The fourth season was confirmed following the conclusion of season three, alongside the announcement of a second film. After holding the Founder’s Festival and establishing diplomatic ties with various nations, the Jura Tempest Federation began pushing toward what the show calls the Human Monster Coexistence Sphere.

That progress has not gone unnoticed, as certain factions view Rimuru’s rise as a Demon Lord to be a genuine threat, with Granbell Rosso and his granddaughter Mariabell Rosso positioned at the center of that opposition. This is the same conflict currently playing out on screen as episode 21 approaches.

For long time fans, the structure of ‘That Time I Got Reincarnated as a Slime’ season 4 has been unusual compared to earlier seasons, with its five cour format and occasional scheduling shifts making the release calendar something viewers have had to track closely. Even with the earlier delay, the show has proven it can course correct without losing its audience.

As episode 21 approaches, the tension between Tempest and its political rivals shows no sign of cooling off, and Rimuru’s next move could reshape the balance of power heading into the back half of the season. What do you think Rimuru and Tempest’s next move against the Rozzo family will be once episode 21 finally drops.