Mio is full of guilty feelings toward her husband and anxiety about pregnancy after making an overnight mistake with a man who was a classmate at the reunion. - Her brother-in-law, Takashi, who happened to come to Tokyo to stay overnight, noticed that Mios appearance was strange and began to explore. - I heard from my brother that my sister-in-law is worried about her pregnancy, even though she shouldnt have a married couple at night. Maybe shes having an affair ... Takashi has been watching Mio since she first met her. Is squeezed into Mio with that as a story ...