Tsuyoshi is the younger brother-in-law living under the same roof as his older brother and his wife. At the family dinner table, he torments his sister-in-law, Ayane, with a vibrator. Though constantly aware of her husband's presence, Ayane finds herself increasingly drawn to Tsuyoshi. Fearful of her brother-in-law's words, her body nevertheless falls further under his control. She is taken advantage of when her husband is asleep, then surrounded by his friends and gang-raped. As Ayane is pushed closer to her breaking point, her body continues to writhe uncontrollably, overwhelmed by relentless pleasure.