Ryota is a healthy male college student who grew up in a very ordinary happy family.His father, who tends to go on business trips, always tells Ryota, "You will be the only man in this house. I'm asking for everyone."Yes, except for Ryota, his mother "Yuri", grandmother "Rieko", older sister "Michiru", and younger sister "Rika" are all women.Protecting the extremely beautiful and glamorous women with crime prevention and physical labor as the man of the family... In addition, there is a difficult role... In fact, in this family, incest has become a daily occurrence, and it doesn't matter whether it is day or night, if you have time, H. You have an abnormal side that does things!Mom in the morning, grandma in the afternoon, and sister and sister in the evening. A very popular three-generation drama part 4 that is fun in H!