A group of people go to a summer house for a vacation, unaware of the perils they will undergo during their stay. A school doctor who accompanies them plans on blackmailing one of the women in the group as he got hold of her diary.
One week after losing his wife in an accident, the father of the Makino family finds himself thinking the wrong thing about his four lovely daughters. When the rebellious Natsume gets into trouble at school, it’s time for daddy dearest to administer some discipline of the sexual variety. Soon, he’s giving the same treatment to motherlike Akira, over-achieving Haruka, and sickly Fuyu. Whether they want it or not.