Let's get this out of the way: Hayao Miyazaki's “The Secret World of Arrietty” is definitely just an adaptation of The Borrowers. But it has enough Miyazaki countryside charm to stand out. It's about a tiny family who lives by stealing things from humans. But one day, a human discovers Arrietty while she's out gathering sugar. Sho (Shawn in the English dub.) is a sick child who has some form of heart condition. I think Arrietty is like an inch tall. It's a cute movie, and not too long.
After discovering her, the sick boy wants to help Arrietty. He brings her sugar, and out his mom's old dollhouse for them to live in. But, it makes things worse for her family...because more humans notice them. Being so small, almost everything is a threat to the Borrowers. I like how it plays with perspective. A needle is a sword to Arrietty. A cat is like a dragon. One drop of tea fills her little teacups.
There are some gross scenes I thought, but that's because the Borrowers (Arrietty, and her parents, Homily and Pod.) are so small. People are giants. Bugs are huge and scary. Crickets, pillbugs, spiders...gross. But, Arrietty can fight them off with a needle. Humans are by far the biggest threat to the Borrowers though. The boy's caregiver Haru (Hara in English.), kidnaps Arrietty's mom, and calls pest control. So the last part is them saving her, and moving out.
Arrietty's parents warned her to stay away from Sho , even though he needs rest, and so won't be much trouble. Pod hurts his leg while out looking for Homily, and discovers a wild Borrower named Spiller who says they can live with him on the other side of the river. So, Arrietty and Sho say a tearful goodbye, as the Borrowers float down to the other side of the river in a teapot.
Overall, it's a cute movie about an unlikely friendship and unintended consequences. It doesn't overstay its welcome, has loads of charm, tons of playful perspective shots, and a good story. Plus, Amy Poehler and Will Arnett voice Arrietty's parents in the English dub. I always liked them. Arrietty is voiced by Bridgit Mendler. Anyway, give it a watch if you can.