Having lost her parents and with no one else to rely on, Hikaru ends up living with her father's close friend. Touched by his warmth, her loneliness begins to slowly heal—until one day, she starts noticing another side of him. His obsessive fixation gives rise to abnormal desires that inflict intense psychological and physical suffering on Hikaru. Her arms bound with electrical cords, she is forced into relentless sexual acts and submits devotedly. At the entrance, she is made to wear fishnet tights over her head while being violently deep-throated. In the kitchen, her body is drenched in salad oil and she is brutally doggystyled from behind. Due to financial hardship, he makes the twisted demand that the landlord take Hikaru's body in place of unpaid rent. Hikaru's mind gradually breaks down as her life takes a sudden, dark turn.