Hitomi is an ordinary school-girl with a crush on her track-team leader, Amano. She meets and saves the life of Van, a young prince from that crossed a portal from a different world in order to slay a dragon. Transported to Van's world, Gaia, she finds her fate is intertwined with his, even if her heart still belongs to Amano and later Allen, a gallant knight who bears an uncanny resemblance to Amano.

Lost in Gaia with no apparent way to return home, Hitomi finds that her hobby of tarot card reading is becoming frighteningly accurate, complete with visions of both the past and future that shed light on this new, war torn world.