"Yoko" has a mediocre but happy marriage with her husband who she met at her previous workplace. Although they were modest, they set up a new house and were enthusiastic about living in the new world. Two people go out to greet the residents on the upper floor. It was "Kamada" who escaped from his wife and lived a widower's life. The happy daily life of a married couple is transformed into a nightmare by the hands of a lonely strong man.
