They see it down the river

"There!" Ibuki pointed, her gaze luckily landing on a piece of white fabric that was being carried downstream by the current.

Mikan followed her classmate's finger and saw it as well. She instantly dove into the water and started to swim after it, her body being carried by the flow of the water.

Meanwhile, Ibuki was watching on, her eyes laser-focused on her crush's ass cheeks peeking out of the water like two very round shark fins. Ibuki raised both her hands up before slapping both of her cheeks with her hands to break her "fixation" of Mikan's exposed body. Not wanting to fall too far behind, Ibuki dove in after her.

Now, Mikan wasn't an expert swimmer, or even a halfway decent swimmer; however, she was able to push herself forward along with the current pushing her towards the swimsuit meant that she was catching up faster than she expected. Though between the water splashing and the cool air hitting her bare butt, it made it hard to focus, let alone see her target.