I know I know ... there is a wiki on the game. And the slimes should be found in the swamps. But I just can not find one. I've already caught two arachna and they should be more rare, but I have never seen a slime girl. Do they even exist? Maybe I'm looking in the wrong place? Or am I just so unlucky?  Please help me.

Hi they exist and you can find them were the Wiki says. When you don´t find them you only unlucky =). Good luck

Try the Sea area.

Marsh