There's no stakes here, and that's the whole point. Doraemon pulls a time machine out of his pocket and the kids decide to build a winter wonderland in the middle of summer, and you watch them do it because the joy is in the doing, not the outcome. No villain. No test. No lesson learned at the end. Just four kids, a robot cat, and the permission to spend an afternoon making something beautiful for no reason at all. It's the kind of special you put on when you need to remember what it felt like to want something just because it sounded fun. The inventions are ridiculous. The logic doesn't hold. Nobody cares.
Doraemon: It's Winter! is a single-episode special from 1986, carrying the Doraemon name. The special combines adventure, comedy and fantasy in one short outing.