The protagonist came to the city alone to study for his entrance exams. When he was tired of being stuck in a hotel, he heard that the daughter of his mother's acquaintance was a private tutor, so he invited her to his hotel room. Although he didn't have high expectations at first, the private tutor who came had an amazing body! What's more, it was a beautiful teacher with big breasts, Yukari! The protagonist was no longer able to concentrate on his studies, and even while she was tutoring him, he couldn't take his eyes off her cleavage or her panties when she crossed her legs. So he took the plunge and asked Yukari, "If I get good grades, let me do something naughty!" but...