This winter, as the snow began to fall, I, a college dropout, was being tutored for a certification exam at the home of my friend's mother, Sanae-san (Yuko Shiraki). Being alone with the Sanae-san I admired inside a kotatsu had my crotch on the verge of exploding. That day, too, I was transfixed by Sanae-san's thighs peeking out from the kotatsu, and I couldn't focus on studying at all. Noticing this, Sanae-san began to tease me, playing with my crotch with her toes. And of course, Sanae-san's mischief wasn't going to end there...