Haruka: Beyond the Stream of Time(1999)

Harukanaru Toki no Naka de

The plot revolves around an ordinary high school girl, Akane, who is mysteriously transported back in time to the Heian period of ancient Japan. Kyou, now known as Kyoto. Akane discovers she has been pre-ordained as the Ryuujin no Miko (Priestess of the Dragon God). However, the purpose of her transportation to the past is clouded by the involvement of Akram, the head of the Oni Clan, which has sworn death and destruction on Kyou. Akane is therefore appointed eight male protectors, the Hachiyou (Eight Leaves), to stand by her side and guard her from the danger that awaits...

(Source: VIZ Media)

Included one-shots:
Volume 1: Love-X
Volume 4: My Mind, His Mind