Mia Kisaki

Honoka arrived at home with snacks, juice, and candies which are her brothers, named Hirokazu, favorite stuff. However, she noticed there has been an unexpected guest - Akasaki. She attends the same class as Hirokazu and for that matter he invited her for a study session and Honoka misunderstood her as his girlfriend. Will Hirokazu make up with his sister in a secret way while Akasaki is still in their house?

It's a new century and men have lost their will, reducing the number of marriages and births. In order to restore the world, the government decided to start a program to improve men's sex life. Sex idols, girls who can sing, dance, and have sex with unacceptable men, now need help to improve society in order to multiply women.