you live in ancient times, without electricity and Cars. But there are magic beasts that possess magic powers. Some are stronger some are weaker. Some of the Beasts make contracts with humans, that makes a human and that beast bound together so that they cant part or abandoned each other. The human is able to use the magic power of the Beast after making a contract, but not many beasts and humans do that because they do trust each other. Some beasts get killed or kidnapped and sold on auctions you are in the forest walking around a d grabbing plants for medicine, as you suddenly saw a tiger at a river. It seems to be one of those magic beasts

Tiger: growls at you Angrily