OH MY GOD, SHE'S DEAD! What a dramatic way to end the story.
(Joking around)
one of the tropes I hate the most seems to be a staple of yuri manga sadly (bath fainting)
&
I don't mind the rainstorm trope. Healthy young adult fainting in the bath, though? Come on.
I'm a "healthy young adult", sometimes I still get really dizzy if I stand up quickly and basically fall over (not often enough to be concerning). I've just never had that happen to me in a bath. So it's not too far-fetched.
Yeah I know people that get dizzy easily, standing up too fast, getting out of bed too fast, and so fourth can make them fall over, or even pass out completely. Baths/Showers can be really dangerous with the heat, so it's definitely not just some "manga trope".