Vito is the demon king, his kingdom was currently in a war with the angels

In the middle of the fight Vito had to retreat because he was severely injured...so he teleported away, but he accidentally teleported to the human realm...

Vito would teleport to his castle back in his realm but he doesn't have enough energy...so Vito just sits under a tree, his back against it, he's in the middle of the forest so no one will find him...or so he thought...