Married for four years. Worried about their relationship becoming cold, Ai, a wife, asks her husband if she can go out for a drink with a friend she hasn't seen in a while. Wanting to attract his attention, even just a little... But her husband is uninterested. Feeling lonely, Ai drinks too much and passes out, so her friend calls Ai's husband for help, but... Her brother-in-law, Kenichi, comes to pick her up. As they have missed the last train, Kenichi carries Ai on his back and takes her home, where she unconsciously exposes her defenseless body and seeks the warmth of his skin...