My new school life begins, and I've enrolled in a school where joining a club is mandatory. With no real interests, I'm left confused and unsure. That's when I meet Teacher Yui Hatano. Instantly smitten by her gentle smile, I decide to join the swimming club she supervises, harboring secret desires. Since I'm the only new member, I start spending after-school hours alone with Teacher Hatano, cleaning the pool together. As my eyes linger on her wet T-shirt and the tight-fitting school swimsuit hugging her crotch, our relationship begins to deepen rapidly.