Monaka-chan is a 18-year-old science student with an IQ of over 60, but her overwhelming Ke'ai and cheerful personality have made her an idol. She is a third-year student who is loved by her boyfriend, but she has a secret: she has sex with an older man without telling her boyfriend, her school, or her parents. Why take such a risk? Monaka-chan is good at studying, and she seems to understand the structure of society and how to enjoy life in the future. I don't know if she is the one committing the crime or being violated, but there is a rare raw vagina there. That is the only fact.