Ever since she was a student, Monami has been wearing a bra that is smaller than her actual size in order to hide her large breasts. Knowing this, her former classmate Ririka becomes aroused by Monami's ever-growing huge breasts, and when she comes to consult with him about her problems, he rapes her at night. At first, Ririka, but gradually he comes to accept her feelings and embraces her. Her G-cup breasts tremble when fingered, and her I-cup breasts swing wildly when licked. The two lose track of time as they desire each other's bodies...