A pair of royal dragon siblings, one of whom is a general and the other a prophet, reflect on their lives and prepare to fight the humans who come to kill them.

A young girl marries a wealthy Comte and moves with him to his castle where she befriends his son and becomes bewitched by the mystery of the castle's tower, the donjon. While the Comte is off serving the King, the girl finds herself breaking the one rule surrounding the tower and facing its consequences in an attempt to save her friend.