A teenage girl rescues a mysterious cat from traffic and soon finds herself the unwelcome recipient of gifts and favors from The Cat King (Tetsurô Tanba and Tim Curry), who also wants her to marry his son, Prince Lune (Takayuki Yamada and Andrew Bevis). With the assistance of a fat, grouchy real cat and a an elegant cat statuette come to life (both characters featured in Studio Ghibli's Mimi wo sumaseba (1995)), the girl visits the Cat Kingdom and narrowly escapes again.

When an unconfident young woman is cursed with an old body by a spiteful witch, her only chance of breaking the spell lies with a self-indulgent yet insecure young wizard and his companions in his legged, walking castle.