@feha@kiwifb I believe it's because she was "splashing" into the cold futon. The temperature difference made it feel somewhat like water. Actually, if you put gloves on and put your hand under running water, you'll notice a lot of what we interpret as the feeling of water is actually temperature variation (I think anyway).
idk why sleeping under a kotatsu is supposed to make you get sick... 🤔
wonder if its one of those sayings said to deter people from using too much oil to heat the kotatsu....