Mina, who has been wearing a smaller bra than her actual size since her school days to hide her large breasts, is known to her former classmate Ririka. Ririka, who becomes infatuated with Mina's growing bust, takes advantage of her when she comes to her for advice and molests her. Initially, Mina despised Ririka, but gradually she comes to understand and accept her feelings. Her G-cup breasts tremble when she is manually stimulated, and her I-cup breasts sway when she is licked. The two of them lose track of time as they seek each other's bodies...
