"That Time I Got Reincarnated as a Slime" has secured the top spot in Ebookjapan's isekai sales rankings for the first half of 2026. This commercial success aligns with the ongoing broadcast of the anime's fourth season, which continues the adventures of Rimuru Tempest.
The 345,000-copy surge of Volume 31
The digital marketplace Ebookjapan has identified "That Time I Got Reincarnated as a Slime" as the leading isekai title for the first half of 2026. According to the report, the series has maintained an aggressive growth trajectory, having already surpassed 40 million copies in circulation by February 2023. This baseline of popularity has provided a massive foundation for recent releases to perform exceptionally well in the digital space.
The commercial longevity of the franchise is further evidenced by the performance of Volume 31. As reported by the source, this specific volume—which was released in February 2024—sold more than 345,000 copies in May alone.. Such numbers indicate that the readership is not merely consisting of new converts from the anime, but a dedicated core audience that continues to consume the manga at a high velocity.
A 2026 content scarcity fueling isekai dominance
A broader trend in the 2026 anime landscape is the relative scarcity of new series releases, which has inadvertently benefited established hits. The report notes that while several standout shows have appeared this year, the overall volume of new IP launches remains low. This vacuum has allowed the isekai genre, and specifically the Slime franchise, to capture and hold audience attention more effectively than in previous, more crowded seasons.
This market dynamic suggests that the dominance of "That Time I Got Reincarnated as a Slime" is partly a result of a lean production cycle in the industry. When fewer new competitors enter the fray, legacy titles with proven track records become the default destination for viewers and readers, reinforcing their position at the top of sales charts like those provided by Ebookjapan.
Maribel Rozzo's Greed-derived schemes in Season 4
The narrative momentum of the franchise is currently driven by the airing of the anime's fourth season, which has moved beyond the initial plot involving Maribel Rozzo. The story, written by Fuse and illustrated by Taiki Kawakami, follows Satoru Mikami, a 37-year-old office worker reincarnated as a slime named Rimuru Tempest. The latest season has focused heavily on the intricacies of Rimuru's labyrinth and the escalating threats posed by exxternal manipulators .
Current plot developments center on Maribel Rozzo, who utilizes Greed-derived abilities to orchestrate events from the shadows. while an earlier arc saw Rimuru overcome these schemes, the second part of Season 4 sees Maribel attempting to seize control of Rimuru himself. This conflict serves as a catalyst for the protagonist's further growth, ensuring that the anime remains a primary driver for the manga's ebook sales.
The identity of the absorbed hero's descendant
Current teasers for the second part of Season 4 leave several narrative gaps that have the community speculating. Specifically, the trailer hints at the return of a hero that Rimuru previously absorbed, as well as the emergence of a "surprising descendant." The source does not provide the specific identity of this descendant or the exact nature of the hero's return, leaving these as the primary mysteries for the upcoming episodes.
Because the reporting relies heavily on trailer teasers and official rankings, the specific mechanical details of how the absorbed hero will manifest remain unverified. Whether this return is a permaanent resurrection or a temporary manifestation is a key point of contention among fans that the current production has yet to clarify.
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