There is a small town somewhere in Japan, which is surrounded by nature. In this town, there is a large and gorgeous school, Otobashi Gakuen; which was founded to make the students familiar with nature. The highborn Himemiya Chikane is cool and aloof, the perfect young lady of good breeding. Kurusegawa Himeko is devoted to her, and secretly her friend. Their lives are undisturbed in their school, until an ancient evil suddenly rears its head. To combat it, Chikane and Himeko must take on the roles of shrine maidens of the Moon and Sun.