In the not too distant future, the male birth rate has plummeted, putting humanity at risk of extinction. To prevent a catastrophe, a law was passed on a "license for free sex." The holder of such a license had the right to enter into intimate relations with any woman at will, and the woman could not refuse him.

Based on a game from Moonstone Cherry. Our hero found himself under the care of five stepsisters: Aya, Rio, Hiyori, Koharu and Michiko, after his parents went to work abroad. However, if your parents even leave the country and leave you with five sisters, then anything can happen...