After marrying her husband Yuichi, Rino is never accepted by his family. Barren and childless, she is constantly met with cold stares from her mother-in-law. When Yuichi begins traveling frequently for work, leaving her alone at home, her senile father-in-law starts groping her body. Before long, she's also forced into nightly acts by her brother-in-law, someone who once seemed kind. Even as she resists, Rino's body awakens to pleasure as a woman—eventually submitting even to her father-in-law. Meanwhile, Ayame, her sister-in-law who has long despised Rino, closely observes her degradation and intensifies her cruel actions. Gradually, Rino is consumed by deeper humiliation and despair...