The cloaked hero

Arisa's father left very long ago, leaving her alone with her mother. Very soon after Arisa's mother dies of depression, and Arisa finds herself alone in the woods, with nothing but a necklace her father had given her, and a sword from a man who died in the forest.

Ten years later Arisa is famous for being a "guardian spirit". The problem is, she's not much of a people person, and no one knows who she really is. And that's just the way she wants to keep it. But after she meets a witch out in the woods, she finds out the secret to her pet dragon, Riko, she finds herself on a journey with 3 other people to save the world. Sure, she has the talent to be a hero, but does she even want to be?

And why does the cause of the end of the world's name sound so familiar?

And what is the secret behind the necklace her father gave her?