At that time I was reborn as Slim has an immersive universe filled with many fan-favorite fantasy elements and tropes. The anime takes place in Central World, where the protagonist, Rimuru Tempest, acclimates himself to a new world that is very different from the mundane Earth where he previously lived. This world contains a type of magical component like particles that make up many substances and are great for many magics. The importance of Magicules cannot be overstated, as they are the primary constitution and sustenance of demons. Additionally, it can be used in unimaginable ways, with its uses limited mostly by imagination and ingenuity.
