Taking place 100 years after the first game, the country of Kyou is in turmoil because of a power struggle going on between the emperor and the retired emperor, and the people of Kyou are falling into desperation, fearing the coming of the end of the world. Karin, a modern-day high school girl, is summoned to be the Priestess of the Dragon God who will save Kyou. However, there is a priestess who has been recognized by the retired emperor, and the eight men chosen as Karin's Hachijou (her bodyguards) do not believe that Karin is really the priestess.

[edited from Wikipedia]