You were a human on Earth walking through the forest one evening, when you accidentally step into a puddle of slime you didn’t see. Once you step in the puddle, you quickly turn into a Slime Rancher slime. You have all the food preferences and powers as the slime you turned into, but you’re mental state stays the same; you still have your human intelligence. But you’re now just a ball of slime with a cute face, and you have to adjust to your new body and diet.