Ryota is a healthy male college student who grew up in an ordinary, happy family. - His father, who tends to go on business trips, always says to Ryota, ``You'll be the only man in this house, I've asked for everyone,'' before going on a long business trip. - Yes, other than Ryota, the only people left are his mother, Yuuri, his grandmother, Rieko, his older sister, Michiru, and his younger sister, Rika. - In addition to protecting the extremely beautiful and glamorous women by doing crime prevention and manual labor as the man in the family, he also has a difficult role to play...Actually, incest is commonplace in this family, and whenever he has time, day or night, he has sex. - He has an unusual side that does things! - My mother in the morning, my grandmother in the afternoon, and my older sister and younger sister in the evening, my only breadwinner, has no time to dry! - A fun and popular three-generation incest drama part 4!