@Kevadu naturally. there was literally no value in her changing into the school swimsuit, requiring the bra removal scene. She 'solved it' before she even climbed into the tub. She would have been just fine in the usual school uniform.
the explanations get worse each chapter but we're here for the ecchi not the author's attempt at seeing how far they can go with some extremely convoluted plot. hell the ecchi isn't even that good why am I reading this....
I'm more impressed that she could see and distinguish one screw on a cell phone photo (were it should be like one pixel big at most). She truly is the master of the screw.