22 years old, from Chiba Prefecture. Her special skill is badminton. She graduated from university a year ago and got a job at a local company. "I've always lived at home, so I've never even masturbated," she says. The first time she had sex with her boyfriend when she was 20, was the only time she had sex in her life. This is the story of how a girl who was almost a virgin experiences intense eroticism and becomes an adult woman.