Fuka's relationship with her husband has completely cooled. One day, she receives a sudden invitation from her coworker, Koishima. He prepares her favorite coffee and says, "Why don't you come over to my place?" She knows she should refuse such advances, no matter how difficult her marriage has become. Yet, her heart wavers. Her husband never listens to her when he comes home. So, just for a little excitement, she decides to step into another man's house. What happens there will spark a new romantic feeling within her.