The wife arranged for the birth to take place at a hospital near her parents' home, so she was away for a "homecoming birth." The young husband, who was busy with his office job, sent his wife off with a smile, thinking that she would be living alone for a while. One day, the wife's friend, Mirai, came to visit. It turned out that since the wife was visiting her parents' home and things around the house were probably a lot of work, he had come all the way to help with the housework and other personal needs. Although he was grateful, he couldn't help but notice the juicy curves of his wife's friend's body...