For me, 'That Time I Got Reincarnated as a Slime' stands out. The world-building and plot development are really engaging. Also, the characters have a lot of depth.
Well, it's a bit hard to pinpoint exactly which was the very first one. But some early examples could include 'El-Hazard: The Magnificent World', which had elements of the isekai genre.
Adult isekai novels might also have a different tone. While regular isekai novels can be light - hearted and aimed at a wider audience, adult isekai novels may be more targeted towards an older audience who can appreciate the more complex storylines and adult - themed elements. For instance, they may deal with themes of loss and regret in a more profound way as the characters adapt to their new isekai existence.
Isekai Quartet indeed has a manga. It offers a different perspective and sometimes delves deeper into the story compared to the anime. The manga can be a great companion to the animated version for fans wanting more of the Isekai Quartet world.
Another one could be 'Overlord'. In this novel, the protagonist is stuck in a game - like isekai world. It has elements of strategy as the character, who was once a normal gamer, now has to rule over his new domain in this strange world.
I'd recommend checking out online manga libraries such as Comixology or Crunchyroll Manga. They often have a good selection of isekai titles. Also, some local libraries might have physical or digital copies you can access.
Isekai manga is a genre where the main character gets transported to another world. It's different from others because of the focus on this world-jumping aspect and the adventures that follow.
For must-read isekai manga, 'Sword Art Online' is a great choice. It combines action, adventure, and a touch of romance. The virtual world it creates is both exciting and immersive.
It could be a story about a journey in an isekai (another world) guided by the moon. In manga and novels of this kind, there are often unique characters and fantastical settings.
The popularity also varies depending on the marketing and adaptation. If the manga gets a great anime adaptation that reaches a large audience, it can boost the popularity of the manga version of slime isekai. Similarly, if the light novel has a successful spinoff or a well - known author associated with it, it can gain more popularity. Overall, it's hard to simply say which one is more popular as they both have their own strengths and fan bases in the world of slime isekai.