Toko, a pure and shy married woman who has known no man other than her husband, Yoshimasa. Their intimate moments always took place in complete darkness, with the lights turned off. Though Yoshimasa loved Toko deeply, he one day began to wonder: "Is Toko truly satisfied? What kind of sounds would she make if another man held her?" With these thoughts in his heart, he asked a young man he met online to sleep with his wife. Unaware of the arrangement, Toko waits in bed with the lights off as usual. The stranger gently speaks to her before taking her for the first time. A tense, emotional drama unfolds through the charged atmosphere and Toko's unexpected reactions.