G Cup Binkan Seito Kaichou ~Chichi Fetish Chichi Momi Hen~

Ukyo is a high school student. One day, he meets a girl who looks for him. Her name is Arisa and she is the captain of the student council, having big breasts and wearing glasses. He is asked to be the vice-captain to support her. At first, he refuses her offer, but she doesn't give up. He tells her that if she lets him touch her breasts, he will accept it. She gets mad and leaves as he expected, but...