O Maidens in Your Savage Season Vol. 2 (manga)

IF I HAD TO PICK...

After Nina mentions that she wants to have sex before she dies, the Literature Club starts getting overwhelmed by the complications, the doubts, the delights--just the idea of sex! But the girls must focus on keeping their club from getting shut down, and an unlikely candidate joins them as their faculty advisor. All the while, Kazusa wrestles with the confusing change in her relationship with Izumi, her childhood friend. As if walking in on him during a solo session wasn't shocking enough, Kazusa realizes she might like-like him.