I went to pick up my drunk sister-in-law tonight.

Four years have passed since marriage. Wife Ai, who was worried about her cold relationship, asks her husband if he can drink alcohol with a friend he's met for the first time in a while. He wants to be a little bit more interested... But the husband is indifferent. Due to this loneliness, Ai drinks too much and goes out of control, and his friend calls Ai's husband for help... His brother-in-law comes to pick him up. The last train is gone, and Kenichi takes Ai home for the time being, and he unconsciously reveals himself defenseless, and asks Kenichi for the warmth of his skin...