A boy named Sh? remembers the week in summer he spent at his mother's home with his maternal great aunt, Sadako, and the housemaid, Haru. When Sh? arrives, he gets a glimpse of Arrietty, a Borrower girl, returning to her home through an underground air vent.

At night, Arrietty's father, Pod, takes her on her first "borrowing" mission, to get sugar and tissue paper. After obtaining a sugar cube from the kitchen, they travel to a bedroom which they enter through a dollhouse. It is Sh?'s bedroom; he sees Arrietty when she tries to take a tissue from his table. Startled, she drops the sugar cube. Sh? tries to comfort her but Pod and Arrietty leave.

The next day, Sh? puts the sugar cube and a little note beside the air vent. Pod warns her not to take it because their existence must be kept secret from humans. Nevertheless, she sneaks out to visit Sh? in his bedroom. Without showing herself, she tells him to leave her family alone but they soon have a conversation, which is interrupted by the crow. The crow attacks Arrietty but Sh? saves her. On her return home, Arrietty is intercepted by her father. Realizing they have been detected, Pod and his wife Homily decide they must move out. Sh? learns from Sadako that some of his ancestors had noticed the presence of Borrowers in the house and had the dollhouse built for them. The Borrowers had not been seen since.

Pod returns injured from a borrowing mission and is helped home by Spiller, a Survivalist boy he met. Sh? removes the floorboard concealing the Borrower household and replaces their kitchen with the kitchen from the dollhouse to show he hopes them to stay. However, the Borrowers are frightened by this and speed up their moving process. Pod recovers and Arrietty bids farewell to Sh?. Sh? apologises that he has forced them to move out and reveals he has had a heart condition since birth and will have an operation in a few days. The operation does not have a good chance of success. He is accepting, saying that every living thing dies.

Haru notices the floorboards have been disturbed. She unearths the Borrowers' house and captures Homily. Alerted by her mother's screams, Arrietty goes to investigate. Saddened by her departure, Sh? returns to his room. Haru locks him in and calls a pest control company to capture the other Borrowers alive. Arrietty comes to Sh? for help; they rescue Homily and he destroys all traces of the Borrowers? presence.

On their way out during the night, the Borrowers are spotted by the cat Niya. Thereupon Niya leads Sh? to the "river", a small rivulet, where the Borrowers are waiting for Spiller to take them further. Sh? gives Arrietty a sugar cube and tells her that she will always be a part of him and that her courage and the Borrowers' fight for survival have made him want to live through the operation. In return, Arrietty gives him her hairclip, a small clothespin, as a token of remembrance. The Borrowers leave in a floating teapot with Spiller in search of a new home.

The Disney international dubbed version contains a final monologue, where Sh? states that he never saw Arrietty again. He returned to the house a year later, indicating that the operation had been successful. Happily he overhears rumors of objects disappearing in neighboring homes.

https://en.wikipedia.org/wiki/Arrietty
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