黒山戦記 : Chronicles of the Black Mountain

Two days before his 10th birthday, Prince Claus Dayan of the Kingdom of Illmatria finds himself haunted by memories of a long-gone civilization. As an army of Demons threaten to wipe out human civilization once more, Claus decides to make use of his newfound knowledge to save humanity once and for all. Thus, he makes his way to the nearly forgotten frontline of humanity's struggle: the Black Mountain. But is that really all?