During their final summer of elementary school, four friends decide to put their courage to the test in their local cemeteries. Haruka Kaminogi makes one final attempt to separate Yuu Gotou from his domineering mother before the exam begins. Haruka sees a bizarre vision of blue snow while doing so, followed by the arrival of an intimidating silver-haired guy. Later, Haruka and her companions had a similar vision in the graveyard before attempting to flee what they believe to be ghosts. Unbeknownst to the youngsters, the individuals that materialized in front of them are Dragon Soldiers: an elite military force from the realm of La'cryma. The troops have gone to this reality in order to obtain the "Dragon Torque," which they believe is theirs.