We ranked the 10 greatest isekai worlds in anime history.

The anime worldbuilding rating highlights ten isekai series: The Saga of Tanya the Evil, Sword Art Online, No Game No Life, That Time I Got Reincarnated as a Slime, Mushoku Tensei: Jobless Reincarnation, The Eminence in Shadow, Overlord, KonoSuba!, God's Blessing on This Wonderful World!, Re:Zero Starting Life in Another World and Lord of Mysteries. Worldbuilding has been described as essential because it is the main theme in a world tour led by one character himself.

Why is the situation in Isekai more important?

While world-building is considered an important aspect of any anime series, it's said that the isekai genre deserves special attention. The best part of the genre lies in everything from the magical underworlds that make up it to those worlds that are filled with horror and feel close to earth. Isekai adds all sorts of imaginable worlds and gives viewers a sense of context where they are prepared for exploration.

The Story of Tanya the Devil - Almost True

The Saga of Tanya the Evil's world feels so close to the real world that it can be unnerving in the best possible way. Taking place in an alternate version of Earth during World War I, and as brutal as war itself.

Almost everything in this series is realistic except for the use of magic. The characters kill each other with guns, daggers and every other type of warfare found in Europe during World War I. Rating was a unique series that claimed to be the best in the isekai genre, coming from a world unlike any other.

Sword Art Online: The foundation for a boom

Isekai has dominated anime for the better part of the last decade, and before its rise to fame, Sword Art Online set the stage for what the genre would become.

The first iteration of the Sword Art Online franchise takes place in Aincrad, a fantasy video game world whose players are trapped inside.

No game, no life. There is no world like this Isekai

The fact that "No Game No Life" won't have a second season has become a huge meme in the anime community, and it looks like this is never going to change.

The series revolves around Disboard, a fictional world in which all conflicts are solved through games. It's a funny, strange and interesting world that I can hardly wait to see more of".

At that point, I was reborn as a slime - an advanced world-builder.

That Time I Got Reincarnated as a Slime has become one of the most popular anime series worldwide.

It features Rimuru Tempest growing from a lowly slime into one of the series' most powerful characters. As the titular slime acquires new, senseless powers, she develops Tempest's kingdom as a symbol for both humans and demons, facilitating an almost impossible task.

Mushoku Tensei: A world that is growing more and more

Mushoku Tensei: Jobless Reincarnation is one of the most controversial isekai series. The characters Rudeus are controversial, but not in the world itself.

From the continent of evil to Ranoa's magical university and its wonderful suburbs, Mushoku Tensei's world knows no shortage of exceptional natives. It is a complexly structured world without shortcuts that make each episode better on its own.

The Eminence in Shadow: A World That Bends to the Shadow's Will

The Eminence in Shadow is one of the most entertaining anime series. I feel like a character within the series, as the world always bends to its will.

The comedy in "Eminence in Shadow" comes from the fact that shadows are imperfect, and he also doesn't want the world to bend his way. In ratings it is called a great start-to-finish hour, and I don't say how good it would be if the world where soap operas take place changed.

Overlord: The world is not good for Ainz Ooal Gown.

One of the biggest reasons that everyone watches Overlord is because of the characters' interactions with Ainz Ooal Gown. He's one of the most powerful heroes in anime, and they have absolutely no idea what to do with him. The world was not designed for his kind of character, which makes his extreme realism much more enjoyable.

In Overlord, we have a complicated system of nations and governments that is almost irrelevant when you're around Ainz; he can destroy an entire nation with the flick of his finger, and it never tires us to watch as the world tries to understand his god-like qualities.

Kono Subar: A world of laughter in harmony with humor

KonoSuba God's Blessing on This Wonderful World! is one of the most entertaining isekai anime ever created. The writing is smooth, the characters are adorable, and the world itself has a silly sound to it.

In most comedy anime series, the world is normal but the characters are not. The characters' senseless actions are intertwined against the normality of the world; however, KonoSuba throws it in the trash and never looks back.

Re: Zero is incredibly cruel.

Re:Zero Starting Life in Another World is one of a kind. The ratings say that it's one of the most beautiful and worst anime series at the same time, and the subtlety of bringing these two opposite forces together makes no sense.

Re: Zero's world can make viewers laugh, cry, hope, hate and more. Anything is possible in the storyline, which is hardly a good thing at all. It's one of the darkest worlds on this show ever, and it's a key to whatever happens.

The Bible says: "The earth is full of the knowledge of Jehovah, as the waters are abundant in the heavens".

The world of Lord of Mysteries is incredibly detailed and feels like it took hundreds of years to create. Zhou Mingrui has stood on the world stage since his awakening as Klein Moretti, a Victorian-esque area filled with steampunk elements, otherworldly magic, and some of the most amazing facts in anime.

Each episode takes us a step further into the world of Lord of Mysteries, and it usually feels like there are more questions than answers, which is far beyond what's acceptable in many movies when they're so ambitious. But for LORD OF MYSTERY, JUST holds true.

Readers' challenges and original images

The page also posed a challenge to readers: "Rearrange the anime series in order of their Japanese release date".

Its captions include Tania playing the piano in Tanya the Evil's Saga; Kirito and Asuna sitting together at the end of Aincrad from Sword Art Online; The vast world of Disboard in No Game No Life; Rimaru being reborn as Slime, a fish of that time, while watching Tempest City locals; Rudeusyrat Great Zanoba looking down on Tensei Atofe; Cid seeing himself as one of the power leaders with red-eyed glowing eyes in shadow comedy Eminence; Lord Mushik sharing fishing gear with Hoy Klein in Mysteries.

For readers, the list turns world-building into a primary lens for deciding isekai. The question posed was not only whether one character could fight, dominate, joke or survive but also whether the world could absorb, challenge or enhance this character. A terrain setting can make horror real, and a game world may feel like its rules are fate, while a brutal setting might feel like it gets every psychological trick.