Asuka's Stone

Asuka's grandfather has been collecting crystals for as long as she can remember and even longer than that. Unfortunately, some of the crystals that he has collected have attracted the attention of a neighbor with a dark secret. Now it is up to Asuka and her grandfather to use these same crystals to save someone they love from the grip of a vicious old crone with powers to harm them.
The pair end up on an adventure where they must stay ahead of the old woman while dealing with centaurs and other mythical creatures. They must keep the skull-shaped crystals away from the old woman at all costs. On their journey, Asuka learns that her grandfather is far more than what she thought he was. She also finds that she might have powers that she didn't know she had.