Sei married Mairiko, an older former colleague's wife, and was living happily. However, Sei's boss, Oshima, threatened him out of jealousy: "Women like Mairiko who are beautiful and gentle are the most likely to have affairs." Anxious, Sei gave Mairiko a smartphone with a location tracking app, claiming it as a gift, since she still used an old feature phone. One day, while monitoring Mairiko's movements, he saw that she was heading towards a love hotel district. Her movements then stopped for three hours inside the love hotel...
