Yuu and Sumire are full-time housewives who live in the same apartment and are best friends who go back and forth between each other's rooms.One day, a fraudulent investment-related business comes to Sumire's room.Yu goes to Sumire's room with her husband and drives her sales person away.She was Sumire who was saved by Mr. and Mrs. Yu, but that was the trigger for a gruesome incident...The salesperson is actually a mob, plotting a circle of revenge involving two couples.She is soon forced to replace her husband and urges her to cum inside.