During a summer stay at his aunt's home, the frail Shou stumbles upon a remarkable revelation: a miniature girl the size of his finger, whom he names Arrietty. As part of the Borrowers, surviving on minuscule human belongings, Arrietty resides in the house's basement with her parents, Pod and Homily. While Shou initially marvels at his extraordinary neighbors, he soon learns of the challenges they endure – including secrecy and perilous journeys into human territory for sustenance. Despite warnings, Arrietty forms a bond with Shou, setting off a chain of events that could alter their fates. This visually captivating tale unfolds a touching friendship that bridges the divide between two disparate worlds.