Forced to wear clothes that don't fit her, and with her nipples and buttocks exposed every day, her stepbrother's lust is aroused by his stepdaughter Rin, who one day finally reaches his limit and attacks Rin. Rin is at an age where she is starting to become interested in sex, and even though she resists, she gives in to pleasure and crosses the forbidden line. She is then attacked by her stepfather, and becomes addicted to the pleasure of incest...!!