Kana was sexually harassed by her husband's brother, Masayuki, on a daily basis. As her husband bows his head, Kana smiles gently and says, "I just have to endure it." And since it's her husband's first day off in a long time, the couple is seeking each other's bodies on the spot... Not realizing that her brother-in-law is watching them... her husband has to leave for work due to an unexpected assignment. Kana, who was looking forward to their nighttime encounter, indulges in loneliness and masturbates. However, as she is immersed in the afterglow of her orgasm, her brother-in-law suddenly bursts in and attacks her. Kana tries to run away, but she can't do anything against the strength of her brother-in-law, who is excited by her dripping breast milk, and she can't help but say, "It feels good..." as he penetrates her for the first time in a while. Her desire is not enough for just one time, so she accepts her brother-in-law and heads to the couple's bedroom...