We've been married for 4 years. Ai's wife, Ai, was worried about her declining marital relationship, so she asked her husband if she could go out for drinks with her friend, whom she hadn't seen in a while. She wanted to attract her attention even just a little bit... But her husband is uninterested. Due to her loneliness, Ai drinks too much and collapses, and her friend calls Ai's husband to ask for her help... The person who came to pick her up was her brother-in-law Kenichi. With the last train running out, Kenichi took off on his own with Ai on his back.