The unicorn named Lay was a very adventurous creature.  This time around he wanted to go to the human world but to go there, he has to pass through the Forest of Myst in which creatures never came back after entering the forest.  Nobody knows whether those creatures managed to reach the human world or simply died in the forest.

In the forest, he met an injured dragon named Kris who he will later form a strange friendship with and perhaps something more... but anything more was forbidden since they are two completely different creatures and other obstacles arises as they journey along the Forest of Myst.

After all... Kris is a predator and Lay CAN be a prey.