Ryota is a healthy male college student who grew up in a very ordinary happy family. His father is often away on business trips, and always tells Ryota, "You will be the only man in this house, I'm counting on you all." That's right, other than Ryota, there are only women in the house: his mother Yuuri, his grandmother Rieko, his older sister Michiru, and his younger sister Rika. As the man of the family, he protects these extremely beautiful and glamorous women by doing crime prevention and manual labor... but he also has a difficult role to play... In fact, incest is a daily occurrence in this family, and he has an abnormal side to him that does naughty things whenever he has free time, day or night! With his mother in the morning, his grandmother in the afternoon, and his older sister and younger sister at night, the only breadwinner has no time to dry! Part 4 of the popular three-generation incest drama that's full of erotic fun!