The “adult school” is a public institution which the government set up based on the Second Compulsory Education Bill in order to halt the declining birthrate problem. It is a school where men and women over 30 who have not had any sexual experience are made to enrol. Elite bank employee Arakawa Hideto (Miura Haruma) is suddenly required to enrol in the school by the country. Despite being agitated about the government’s knowledge of his sexual experience, he reluctantly goes to school. As a condition for graduation, he has to learn romance and lose his virginity in this school where students can start over a youth which they had not experienced during their teens and grow as adults.