Sin's Of One Unicorn

Their has been myths about unicorns being real, but the only thing is that its not a myth. There REAL! and their in hiding. But one day Akio's kingdom was under attacked by the beasts from the underworld. They have captured her mother and father, and her brother is still missing. someone in the kingdom has broke the othe and told their location.
She got away from the beasts only to be lost in the forebenden woods.
How will Akio figure out how to get her family and some of the villagers that have been captured back?