At dusk, on a beach in Japan, a young boy falls asleep and begins to dream, but soon he has company -- a tiny oni, creeping up from the sand. Throughout the night, one by one, more oni appear, until there are ten in all, and they grow bigger, too. They begin beating their taiko drums, louder and louder. They sail on a raft, play games, have a big meal, and eventually chase away the boy's scary dreams.