The story begins far in the past, when a great war was pursued by mankind against demonic armies attempting to enter the human world. Five brave heroes created armlets to restrain the demon gods.

Enter the 15th century, France and England battle each other during the Hundred Years’ War. In a quest to turn back the rueful army, a young crusader named Jeanne is commanded by voices to use the power of the mysterious armlet that appears on her wrist to seal away the demon king and recover her homeland once and for all.