Arrietty isn't your ordinary fourteen-year-old girl--she's small enough to make her home under the floorboards of a typical house, "borrowing" what she and her family needs from the giants in whose shadows they live. A young boy named Sho befriends Arrietty, but when adults discover the Borrowers, Arrittey and Sho must work together to save her family.

The mysterious masked spirit called No Face wreaks havoc in the bath house after being let in by Chihiro, while Chihiro searches for a gravely injured Haku and meets Yubaba's very large son along the way.

Before Sen can journey to Zeniba's house to find out if Haku's illness is from a curse, she must confront No Face.