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

Rimuru Tempest’s world continues to grow, and fans are eagerly anticipating the next chapter of ‘That Time I Got Reincarnated as a Slime’ season 4. This season is set to feature a total of 60 episodes spread across five cours, with the first two cours airing consecutively for a combined 24 episodes. This momentum has kept the fandom captivated every week this summer.

With episode 20 just having aired, all eyes are now on the release of the next installment of ‘That Time I Got Reincarnated as a Slime’ and what viewers can expect as Tempest’s political drama unfolds.

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

The show had previously announced a delay, moving an episode from its originally scheduled July 31st release to a new date in August due to broadcast changes in Japan. A recap episode was aired to fill that gap, which briefly disrupted the numbering fans had anticipated earlier in the season.

Since then, ‘That Time I Got Reincarnated as a Slime’ has returned to a reliable Friday release schedule. This stability has been a welcome change after some earlier turbulence this season, allowing the show to maintain a consistent weekly release once episodes are confirmed.

New episodes of ‘That Time I Got Reincarnated as a Slime’ season 4 are available on Fridays at 7 a.m. PT and 10 a.m. ET on Crunchyroll, complete with English subtitles and an English dub. This means international viewers can quickly catch up with Rimuru and the rest of Tempest after the Japanese broadcast.

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

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

Since episodes typically go live in Japan around midnight local time, fans outside Japan should expect the same familiar pattern for episode 21, which will likely land comfortably within the Friday afternoon window for most of Europe and the morning window across North America.

The current arc of ‘That Time I Got Reincarnated as a Slime’ has been building toward the fallout of the Chronoa the Hero arc, with fans closely following the escalating political tensions surrounding Tempest. Demon Lord Rimuru’s vision of creating an alliance between humans and monsters is inching closer to reality, even as it draws new enemies from the shadows.

Granville Rozzo and his granddaughter, Maribel Rozzo, remain at odds with Rimuru, clashing over their belief that humanity must be safeguarded through direct rule rather than coexistence with monsters. This conflict has significantly influenced the latter half of the season, giving it a more pronounced political edge compared to earlier arcs of ‘That Time I Got Reincarnated as a Slime’.

Meanwhile, Demon Lord Leon is pursuing his own separate ambitions in El Dorado, and the anime has hinted that the awakening of a new Hero is imminent. With episode 20 already focused on Chronoa the Hero, episode 21 is expected to advance that storyline, likely intensifying the standoff between Tempest and its adversaries.

The fourth season was confirmed following the conclusion of season three, along with the announcement of a second film. After hosting the Founder’s Festival and establishing diplomatic relations with various nations, the Jura Tempest Federation is moving toward what the show refers to as the Human Monster Coexistence Sphere.

This progress has not gone unnoticed, as certain factions perceive Rimuru’s rise as a Demon Lord to be a genuine threat, with Granville Rozzo and his granddaughter Maribel Rozzo positioned at the center of that opposition. This ongoing conflict is currently unfolding 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 unique compared to previous seasons, with its five cour format and occasional scheduling changes requiring viewers to keep a close eye on the release calendar. Despite the earlier delay, the show has demonstrated its ability to adapt without losing its audience.

As episode 21 nears, the tension between Tempest and its political rivals shows no signs of easing, and Rimuru’s next move could significantly alter the balance of power as the season progresses. What do you think Rimuru and Tempest’s strategy will be against the Rozzo family once episode 21 finally airs?