Yumi married the eldest son who had taken on her father's debts to save the family home, but even after marriage, she continues to be treated like a maid. With no real status as a wife, she is forced to serve the family sexually, her daily life filled with suffering and oppression. One day, her father-in-law approaches her again, demanding creampie sex. Trembling, Yumi senses deep down that something within her is beginning to change.