In the Isekai genre, not many anime can hope to compete with “That Time I Got Reincarnated as a Slime”. Following the story of Rimuru Tempest, Slime has become a global phenomenon, and its popularity in Japan is outstanding. Even on the international anime streaming platform Crunchyroll, the series consistently maintains top rankings.
Currently, on Crunchyroll, there is a wide array of exciting Isekai series for all fans to enjoy, and while each of them offers something different, there is only one series that can reign supreme at the very top. This new series is none other than That Time I Got Reincarnated As A Slime, which now stands as the best-rated Isekai series of all time on Crunchyroll, leaving every other in the dust. That Time I Got Reincarnated as a Slime is going to keep expanding its influence with all the new anime content it gets, and soon, it will even be able to compete with the biggest shonen hits, both on Crunchyroll and in physical sales.
That Time I Got Reincarnated As A Slime Stands As Crunchyroll’s Highest Rated Isekai
The Isekai genre can often seem oversaturated because of how overdone some of its concepts are, but there are still some standout series that make their presence known every year. In the midst of countless releases every year, some Isekai series stand out and distinguish themselves in their own way, and one of the most highlighted otherworldly series of the last decade has been none other than “That Time I Got Reincarnated as a Slime.”
The story of That Time I Got Reincarnated As A Slime starts like the typical Isekai, with a man dying and being reincarnated into another world. For Slime, this man is Satoru Mikami, and he becomes a slime creature that takes on the name Rimuru Tempest. Rimuru then goes on a journey to grow in strength and gain more allies. While the story is definitely basic at first, it develops and expands in some gripping ways, and that is why it is still incredibly popular even years after its debut.
Slime’s story was first adapted into an anime in 2018. It is this initial anime adaptation that skyrocketed its popularity and made it the icon that it is today. Right now, “That Time I Got Reincarnated as a Slime” is also airing on Crunchyroll, which is the biggest anime streaming platform outside of Japan. On Crunchyroll, Slime has caught many people’s attention, and much of it is down to its unique charm and an amazing cast of characters. Out of all the Isekai series hosted on the platform, it is the second most rated, just behind Mushoku Tensei in sheer number. Slime has over 381k fan reviews and, in total, 4.8 out of 5 stars.
This is an impressive number, and the series has achieved that over the course of 4 anime seasons, spanning from 2018 to the most recent release in 2026. Slime’s success was always to be expected. After all, even in its home country, Japan, it is the highlight of the Isekai genre. Sales-wise, it is simply unbeatable, showcasing over 63 million sales in total, something inconceivable for every other Isekai series.
Other Popular Crunchyroll Isekai And How They Compare To Slime
Crunchyroll is a massive anime streaming platform. As a result, it hosts an incredibly large and always expanding library of anime series. In this massive library, we see quite a few Isekai series, and in them, Slime dominates when compared to some other Isekai hits. As previously stated, the only Isekai series that surpasses Slime in sheer number of fan ratings is Mushoku Tensei, but it’s still beaten by Slime when it comes down to score. Mushoku Tensei has over 400k ratings with a 4.7/5. Mushoku Tensei has also only just surpassed Slime in overall ratings, as it was boosted with recent new anime Season 3 release, which grabbed fan attention more so through its controversial nature than its quality. In terms of ratings, Slime has it beat.
Other strong competitors include Re:Zero – Starting Life in Another World, which many would consider an iconic Isekai. On Crunchyroll, the series has 272.7k ratings with a 4.7 score, and that is with four anime seasons in total. In other words, on Crunchyroll and in Japan, Slime has been the dominant force, and its grip on the top spot will only keep on increasing as more installments come out in the future.
Slime’s Future Releases On Crunchyroll
That Time I Got Reincarnated as a Slime already has a long history with successful anime adaptations, as is evident with its ratings and fan reception on various platforms. Slime’s first season, which helped it establish itself, debuted in October 2018 and ended in March 2019. Its second season returned in January 2021 before ending in September 2021. Its third season then followed with 24 episodes, airing between April 5, 2024, and September 27, 2024. Slime even has a few movies. The first one is titled “That Time I Got Reincarnated As A Slime the Movie: Scarlet Bond,” and it was first released in 2022. More recently, Tears of the Azure Sea came out in 2026, and established itself as a huge hit.
The latest season for Slime was Season 4, split into two cours, running between April 3, 2026, and September 25, 2026. With that being said, Slime Season 4 Part 1 and Part 2 are only two small fragments of a far larger season, and this is because it has been confirmed that Slime Season 4 will be made up of five cours in total.
In other words, for now, we await the next cour of Slime season 4, which is already set to premiere in July 2027. A concrete release date, as well as an episode count, are set to be determined later. For now, Season 4 Part 4 and Part 5 have not been announced, but we do know they’re coming. We’re also expecting, in the upcoming year, a new Slime spin-off anime known as Clayman’s Revenge, which is set to debut early in 2027, starting April.
All in all, with the main novel of Slime having concluded with 23 volumes back in November 2025, the anime studio has ample room to adapt even more content, probably stretching into 5 seasons or more in the future. All these new projects will inevitably boost Slime’s score on Crunchyroll, especially with the consistent production put forward by Eight Bit. By the end of its run as a whole, Slime will likely cement itself as the greatest Isekai of all time and possibly become the first of the genre to surpass 100 million copies in circulation in Japan, which is an impressive feat that no other series of the Isekai genre is even close to hitting.
That Time I Got Reincarnated as a Slime has four seasons out at the moment, with Season 4 Part 3 confirmed for July 2027. All seasons can be found and streamed on Crunchyroll.