Ryota is a healthy male college student who grew up in a very common and happy family. My father, who tends to go on business trips, always goes on a long-term business trip by calling out to Ryota, "The only man in this house is you, I asked everyone." Yes, except for Ryota, all of them are women, including her mother, Yuuri, her grandmother, Rieko, her sister, Michiru, and her sister, Rika. Protecting exceptionally beautiful and glamorous women as a man of the family with crime prevention and hard work ... There is also a serious role ... Actually, this family, incest is becoming commonplace, and if you have free time regardless of day or night, H It has an unusual side to do something! There is no time to dry the big black pillar, which has only one mother and sister in the morning, grandma in the daytime, and sister and sister in the evening! Popular three-generation incest drama part 4 that is fun with H!