First, let's add some lore.
The earth isn't what is used to be, as stated in the OP. Every species on earth was mutated, and now monster people roam the planet. Humans are now a rarity, making up a minuscule amount of the population. Male humans are even rarer, being one of the rarest things next to Bizarre slime.
Bizarre slime is a magical substance that's fabled to grant it's users a wish. The slime synthesizes itself into matter, of what the user desires. So that obviously means you can't get something like say, good luck, but it CAN make a living creature! There are two ways to use the slime. You can use it with the magic ritual, or the scientific lab way. It's better to use it in a set-up chemistry lab, as you get "more" out of the slime, however it's hard to get the materials to set it up with. The magical way is the traditional way, as they all say. You get a bit less, but it's easier. And more dramatic.
There are some more unique characteristics about the earth now, such as the fact that floating islands exist now. There are huge landmasses, with ice in the bottom of them, arranged in a structure like the veins you see in your hand. That was a bad analogy, but shit, I'm not a poet.
There are many other, yet fewer-than-there-used-to-be cities on the planet. Major cities include, (Ordered by population)
The City of Madness
Deathville
Spookytown
Exorama
Villagetownsville City
Lupus
Death City
And more™!
You are in Deathville, a town near what used to be Stockholme, Sweden. Long story short, it got destroyed by a gang of giant dragonoid zebra people. This is a decent sized place, and could almost be a city. You were raised by your adoptive mother, Saria Rondo, who took you in after finding you on her welcome mat. 12 years later, you're now... 12. You're still a noob at Rune magic, because you haven't really been taught much. You mostly educated yourself with books, but it's been getting harder as you try to delve into the more advanced stuff.
If you wish to learn more, please specify.