Harukanaru Toki no Naka de: Ajisai Yumegatari

In a Distant Time OVA

遙かなる時空の中で 〜紫陽花ゆめ語り〜

Whisked away to the land of Kyou, Akane learns that she is the Ryuujin no Miko, and meets the Hachiyou, her protectors. They must defeat Akuram, a demon who wants to destroy Kyou using the power of Azusa, a woman who has the power to absorb human energy. If Akane and the Hachiyou cannot defeat Akuram and bring peace to Kyou, Azusa'a power will destroy the humans.

(Source: ANN)