During their last summer in elementary school, four close friends venture to a nearby cemetery to test their bravery. Haruka Kaminogi intervenes when Yuu Gotou's overbearing mother tries to stop him from going, and Haruka has an inexplicable vision of blue snow and a commanding silver-haired man. Later, the same strange occurrence happens to the group at the cemetery, making them believe they are being haunted. What they do not realize is that the apparitions are actually soldiers from a different dimension known as La'cryma, the Dragon Soldiers. Their mission is to obtain the "Dragon Torque," which they believe is their only hope for survival. To their surprise, they discover that the Dragon Torque is actually Haruka herself. As the Dragon Soldiers pursue her, Haruka finds solace in the enigmatic silver-haired man, who claims to be a version of Yuu.