Because it's a trope. If you /do/ overheat by staying in a hot bath too long in real life, you really will pass out, but it takes quite a long time and the water has to be really hot for it to happen. It's used as a plot device, tho......I have always wondered why it is in all manga/anime if they go to a bath house/bath tub someone always pass out. Someone know why that is?
It's just tropes being tropes, I guess. Sort of like how characters will get sick if they're cold for 5 seconds. That, or the Japanese are just extremely frail lmaoI have always wondered why it is in all manga/anime if they go to a bath house/bath tub someone always pass out. Someone know why that is?