Tamaki's parents have gone abroad on business and she starts living with her grandmother in a small village surrounded by mountains. She is happy to live in the country, but there are mysterious monsters that only Tamaki can see.... Also, some boys appear in front of Tamaki and they protect her from them. One day, her grandmother tells her a secret, "You have returned here to seal off Onikirimaru, a sword. That's why you are back."
an extended description!