There are many genres in the anime industry, each focusing on a different type of story, and it goes without saying that one of the most popular is definitely Isekai anime genre. The Isekai series features a main character who is usually transported to another worldand while the genre has definitely gotten a bad rap over the years, it seems to be making a comeback thanks to some quality anime adaptations.
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Recently, The 9 most watched Japanese Isekai anime series have been revealed via ABEMAand the number one choice may come as a surprise to many. That Time I Got has officially been revealed as Japan's most popular Isekai animethus defeating Re:Zero and Mushoku Tensei. In the next few years, fans may see a greater influx of Isekai as they become more and more popular around the world.
That Time I Was Reincarnated as a Slime is Japan's greatest Isekai anime
Isekai is definitely a very interesting genre of anime. The concept is quite simple, where the character is transported to a new, completely different world, and from there the possibilities for building exciting stories are almost endless. Japan is quite fond of the Isekai seriesand their popularity has been high for several years. That said, the Isekai genre is pretty oversaturated, but some series definitely stand out among the rest.
To determine the most popular Isekai of the group, ABEMAa huge streaming service in Japan, revealed The 9 most streamed anime that fall into the Isekai category. It was for “Good Another World Day”, an event that fell on November 12th. This revealed ABEMA's “Final Ratings for Isekai Anime”. the best Isekai anime is nothing but 'That time I was reincarnated as a slime.' This result may surprise some, but it makes sense. That Time I Got Reincarnated as a Slime is popular overseasbut it became a monumental anime in Japan.
The story of 'That Time I Was Reincarnated as a Slime', as the title suggests, follows the story of a man from the real world who died and was reincarnated as a slime in a completely different world. It will then take the name Storm in Rimuru. This anime premiering in 2018 with its first season and currently has three seasons, with the latest coming out in 2024.
Another top 9 Japanese Isekai anime have been revealed as well
That Time I Got Reincarnated as a Slime finished first in the category ABEMA platform. However, the rest of the top 9 are also made up of interesting series. Here is the full list of final rankings for the Isekai anime:
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That time I was reincarnated as slime
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Ruler
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Eminence in the shade
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Mushoku Tensei: Reincarnation Without Work
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Is it bad to try to pick up girls in a dungeon?
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Re:Zero — Starting life in another world
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KonoSuba: God's blessing on this wonderful world
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The Rising of the Shield Hero
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Sword Art Online
That time I was reincarnated as a slime Author reveals when the series could end
Fuse revealed that That Time I Got Reincarnated as a Slime may be coming to an end sooner than fans think.
All of these series were monumental in the Isekai genre, and the vast majority of them should be easily recognized by fans abroad, especially like Re:Zero or Sword Art Online.
Isekai Anime are regaining popularity around the world
The Isekai series has always been huge in Japan, but it's definitely not the most popular overseas, mainly because of how over the top it is. Most of the series in this genre are quite similar and contain low level comedy. Some others cover weird or rather bizarre topics that are not at all appealing to fans.
Still, the Isekai genre seems to be growing in popularity again, as seen in some of the hits in 2025. Lord of the Mysteries was one of the biggest Isekai anime this yearand it certainly lived up to the hype. Fans are definitely looking forward to the next one. Solo Leveling is also one of the most popular anime series outside of Japan right now, even though it's not Isekai, many of its elements are taken from the genre, and thus it can't be completely separated from it.
Source: PR Times
