Three years into marriage, Airi is preparing to welcome a new family member and build a happy household. Yet, deep inside, she feels unfulfilled. Her daily life is plagued by sexual harassment from her lecherous father-in-law, while her husband remains too busy to listen or share intimacy with her at night. Isolated within her own home, Airi's sexual frustration continues to grow. Her father-in-law's advances escalate, and despite being cornered, she is forced to endure. Eventually, the old man's filthy, lustful desires spiral out of control, leading to a violent assault against her.