When a witch's curse turns young Sophie into an old woman, she runs away from home. Soon she finds work as a cleaning woman in a moving castle belonging to the mysterious wizard Howl. A fire demon named Calcifer offers to remove Sophie's curse if she will help to free him from his magical contract with Howl.

Originally published in Japan by Tokuma Shoten Co., Ltd. Adapted from the motion picture Hauru no ugoku shiro = Howl's moving castle.