Funny how she's still wearing her hair ribbon. Usually girls take those off while swimming or taking a shower. Although it's a simple school swimming suit, she looks so erotic with it. Most high school students don't wear Sukumizu anymore, so I guess this is before the games took place and Kasumi is only middle school aged here. Damn, kids develop so fast nowadays.
Her boobs are ginormous and she's showing off all her legs. Her skin is so white and the swimming suit only covers bare minimum of her ass, so most of her ass cheeks are visible. Although she doesn't have to, she's purposefully raising her ass up high, probably to show it to male teachers and students. Wanna see her from the back. She looks like a complete whore.