Ume and Kame are two old sisters living blissfully among the junk they collect as part of their daily hikes into town. On one such scavenger hunt they find a pile of wool. They bring it back home only to find it comes with strings attached in form of a strange girl. The girl knits a sweater and then promptly unravels it. If you watch the film to the end I am sure you will discover her reason for doing so but I decided to leave it as one of life's unsolved mysteries.