The Desert Island (2) Tanoshî Mûmin ikka : Season 1 Episode 4

Moominfamily and their friends set out for adventure in their new sailboat, and finally arrive at a seemingly uninhabited island. It is, however, populated by some very strange creatures with whom Hemulen has an unpleasant encounter. A terrible storm hits the island and they decide to stay over night, pulling up the boat as far as she will go and taking taking refuge in their tent.