Hortensia, a kingdom that has stood for over 700 years, is attacked without warning by Camellia, one of its principalities, leaving young Alfred Albert, heir of the Dominion of Albert, to grow up quickly and lead his people in defense of the kingdom.

Monsters from Magonian folklore become widespread, prompting a curious boy to see the legendary monster of a nearby cave, and ends up missing. But when Alfred and the others go to investigate the cave, it calls up unpleasant memories for Marius.

Seeking moderate allies within the kingdom, Captain Georg asks Alfred and the others to seek out Adelheid, heiress of the Dominion of Olivier. However, tensions escalate when Didier and the Ecclesiastical Knights arrive to arrest Adelheid.

Alfred and Deflotte are imprisoned, and their jailer, the knight Lucan, is unsympathetic, so the two must resort to desperate measures. Didier reveals to the princess some hidden memories involving the king before sending her off to be executed.

The princess's forces are welcomed into the capital by an old friend. When it is learned that Captain Georg is leading the opposing army, Maurice goes off to confront him. Didier is sent into battle to buy more time. Marielle fears the worst for Alfred.

Alfred and Adelheid come face to face with their late fathers, and are forced to fight them. The truth behind Rugis's rebellion is revealed. As the showdown with Vall d'Hebron reaches its conclusion, some must make the ultimate sacrifice.