What is isekai? Meaning, types and where to start

What isekai means, word by word

異世界 is read isekai, roughly "ee-seh-kai". It is made of two parts: 異 (i), meaning different or strange, and 世界 (sekai), meaning world. So the literal meaning is "different world", and you will see it translated as "another world" or "other world" too. In Japanese it is an ordinary word, and it appears in many long titles, such as Re:Zero − Starting Life in Another World.

As a genre name, isekai is short for a whole family of stories. Japanese writers split them into two main kinds, following the definitions used by Shōsetsuka ni Narō, Japan's best-known web novel site:

• Isekai tensei (異世界転生): "reborn in another world". The hero dies and is born again as someone new, keeping the memories of their past life.
• Isekai ten'i (異世界転移): "transferred to another world". The hero crosses over as themselves, in their own body, by choice or not.

English-speaking fans use isekai for both, and even as a verb: a character who gets "isekai'd" has just been sent to another world. The word is now official English. In March 2024 the Oxford English Dictionary added it, describing a Japanese genre of science or fantasy fiction in which the main character is transported to, or reincarnated in, a different, strange or unfamiliar world.

Where the isekai genre comes from

The idea of a person stepping into another world is much older than anime. Japan has the folk tale of Urashima Tarō, a fisherman who visits a palace under the sea and comes home to find that hundreds of years have passed. Its oldest written versions date from the 8th century. English readers grew up on the same idea in Alice's Adventures in Wonderland (1865), The Wonderful Wizard of Oz (1900) and the Narnia books. Those are usually called portal fantasy, and fans today often describe them as early isekai.

In Japan, the modern genre has a few early landmarks. Haruka Takachiho's novel Isekai no Yūshi (Warrior from Another World) came out in 1979, with the word isekai right in its title. Aura Battler Dunbine, first shown on TV on 5 February 1983, is often called the first isekai anime: a young man riding his motorbike through Tokyo vanishes in an accident and wakes up in a world called Byston Well, where he is made to pilot a giant robot. In the 1990s the idea spread through manga and novels such as Magic Knight Rayearth (from 1993), where three schoolgirls are summoned to save a magical land, and The Twelve Kingdoms.

The big boom came from the internet. Shōsetsuka ni Narō, whose name means "Let's Become a Novelist", opened on 2 April 2004 as a free site where anyone can post a novel chapter by chapter. Isekai became the site's signature genre, and publishers started turning the hits into light novels, then manga, then anime. A few landmarks:

• Sword Art Online: Reki Kawahara first posted it on his own website from 2002. It became a light novel in April 2009, and the anime that started in July 2012 is often seen as the start of the modern isekai boom.
• Log Horizon: started on Shōsetsuka ni Narō in April 2010; the anime followed in October 2013.
• Re:Zero: started on the site in April 2012; the anime followed in April 2016.
• That Time I Got Reincarnated as a Slime: started in February 2013; the anime followed in October 2018.
• Ascendance of a Bookworm: started in September 2013; the anime followed in October 2019.

By the mid-2010s there were so many isekai stories that some contests had enough. A Japanese short story contest banned isekai entries in 2016, and in 2017 a Kadokawa contest for novels aimed at adults banned both isekai and teenage heroes. The genre kept growing anyway, and it is now a regular part of every anime season.

The main types of isekai

Most isekai stories start with one of these setups. The first episode or chapter usually tells you which one you are in, and that says a lot about the kind of story it will be.

Transported or summoned

The hero crosses over in their own body. Sometimes a king or a priest summons them as a hero to fight a demon lord. Sometimes they fall through a door, a well or a magic circle with no warning. In Magic Knight Rayearth, the three girls are pulled away from a school trip to Tokyo Tower. In Re:Zero, Subaru Natsuki is dropped into a fantasy world with no powers at all, except one: when he dies, he wakes up again at an earlier point in time.

Reincarnated

The hero dies in our world and is born again in another, keeping their memories. Very often the death is a traffic accident, and so many heroes are hit by trucks that fans joke about "Truck-kun" (kun is a Japanese name ending for boys), a truck whose job is to send people to other worlds. The joke took off online around 2015. Not every hero comes back as a person: in That Time I Got Reincarnated as a Slime, an office worker is stabbed and comes back as a slime, then slowly builds a nation of monsters. In Ascendance of a Bookworm, a student who loves books is reborn as a young girl in a world where books are rare and expensive, so she sets out to make her own.

Trapped in a game

The other world is a video game, usually an online role-playing game. In Sword Art Online, thousands of players cannot log out of a virtual reality game, and dying in the game means dying for real. In Log Horizon, about 30,000 Japanese players are pulled into the game Elder Tale during an update, and the story is more about building a society than fighting. Some fans do not count these as true isekai when the players' real bodies stay in our world, but most people use the word for them anyway.

Transmigration into a novel or otome game

Here the hero ends up inside a story they already know, as one of its characters: either waking up in that character's body, which fans call transmigration, or being reborn as them. A popular branch is the villainess story: a woman wakes up as the rich, mean rival in an otome game (a romance video game for girls, where the player picks a love interest) and knows that the character is heading for ruin or death. She has to change the ending. Villainess Level 99, an anime from 2024, gives the idea a twist: the villainess is also the game's hidden boss. Korean comics took this setup and made it their own, which our guide to villainess manhwa covers.

Reverse isekai

The direction flips: someone from a fantasy world ends up in ours. In The Devil Is a Part-Timer!, the demon king Satan escapes to modern Tokyo with almost no magic left and takes a part-time job at a burger restaurant. In Restaurant to Another World, a Tokyo restaurant has a door that opens into a fantasy world once a week, and elves, dragons and knights come in for dinner. AniList even has a separate Reverse Isekai tag for these.

Common isekai tropes

A trope is an idea that shows up again and again across a genre. Isekai has a lot of them, because so many stories borrowed from each other on the same web novel sites:

• A god in a white room. Before the hero is reborn, a god or goddess explains what happened, apologises for a mistake, or hands out a gift.
• Status screens. The new world works like a game. The hero can open a window that shows their level, skills and stats, and fights earn experience points.
• Cheat skills. Fans borrow the gaming word "cheat" for a power that breaks the rules, one nobody else in the world has. Many isekai heroes are overpowered from chapter one.
• Modern knowledge. The hero uses what they know from our world, like cooking, farming, maths or engineering, to get ahead in a world that has never seen it.
• Slow life. A quieter branch where the hero would rather run a shop, farm or cook than save the world. In Campfire Cooking in Another World with My Absurd Skill, an office worker is summoned by accident with a group of young heroes, and his only skill lets him buy food from a supermarket back home. He spends the series travelling and cooking.
• Very long titles. Web novel titles often explain the whole setup, so readers know what they are getting before they click.

Fans also use the word loosely. Any fantasy with a status screen may get called isekai, even when nobody leaves their world, which is why people ask whether Solo Leveling counts (it usually does not). Older Western stories like Narnia get the label too. When you search for isekai on a site like AniList, you are using its Isekai tag, which takes the broad view and includes game worlds and stories where someone wakes up inside a novel.

Isekai in anime, light novels, manga and manhwa

Most Japanese isekai follow the same path. A story starts as a free web novel, a publisher turns it into a light novel (a short paperback with anime-style pictures), a manga version follows, and the biggest hits become anime. That means one title can exist in four forms at once, each at a different point in the story. The web novel or light novel is usually furthest ahead, and the anime is usually furthest behind.

• Anime is where most people meet isekai, and new isekai series come out every season.
• Light novels are the source for most of those anime. Many popular ones are translated into English.
• Manga versions are often adaptations of a light novel, drawn by a different artist from the novel's author. Some isekai, like Magic Knight Rayearth, started as manga.
• Korean manhwa have their own isekai scene, mostly full-colour webtoons based on Korean web novels. They lean towards waking up inside a novel the hero has read, and towards romance fantasy. Our guide to the best isekai manhwa to start with has hand-picked titles and a live list.

Isekai vs reincarnation vs regression

These three words get mixed up because one story can be all of them. Strictly:

• Isekai is about where the hero ends up: another world, a game or a story.
• Reincarnation is about how: dying and being born again. It can happen in another world (which is also isekai) or in our own (which is not).
• Regression means going back in time within your own life, in the same world. It is not isekai, though the same readers tend to like both.

Korean comics use all three a lot, often in one series. For second lives and do-overs, see our guide to reincarnation and regression manhwa.

Where to start with isekai

These are well-known, widely available titles with different setups. We left out series with a lot of fan service or adult content. Ratings and tags are on each title's AniList page if you want to check before starting.

Anime: That Time I Got Reincarnated as a Slime is a good first pick: funny, warm and full of kingdom building. Ascendance of a Bookworm is slower and gentler, a story about a girl who just wants books. Log Horizon suits you if you like strategy and politics more than fights. The Devil Is a Part-Timer! is the easy way into reverse isekai, and Campfire Cooking in Another World with My Absurd Skill is the slow-life pick. Re:Zero is one of the most famous isekai, but it is dark and violent, so it is better for older teens. For an older classic, Studio Ghibli's film Spirited Away (2001) follows a girl who wanders into a world of spirits.

Light novels: Slime, Ascendance of a Bookworm and Re:Zero all have official English translations and go much further than their anime.

Manga: InuYasha (from 1996), where a girl falls down a well into Japan's past, and Magic Knight Rayearth are the older classics. The Slime manga is an easy way to read that story without starting on the novels.

Manhwa: Who Made Me a Princess, about a woman reborn as a baby princess inside a novel, and Omniscient Reader, about the only person who finished a web novel that turns real, are good first reads. The isekai manhwa guide has more.

Trying to find an isekai you half remember?

Isekai stories share a lot of looks, from blue status windows to noble academies, so it is easy to forget which one you saw. If you only remember the plot, open Find by description with isekai manga already picked and add what you remember, like the Reincarnation or Video Games tag, or Romance as a genre. For the other direction, try reverse isekai manga.

If you have a screenshot, a panel or a cover, MangaTrace crops it in your browser and sends it to SauceNAO, Google Lens and other reverse image search engines in one go. It finds titles; it does not host or translate any comics.

No screenshot and only a few details? Our guide to finding a manga you forgot the name of has more ways to narrow it down, from tags to the right reddit threads.