Anna was Kokoro from an early age and learned how to masturbate quickly. She was also interested in sex, but it wasn't until her second year of high school that she actually had sex. When she entered university, her sexual desire was unstoppable, and she grew into a girl with a fair amount of experience. Anna, who is not shy, went to bars alone, even though she had a boyfriend, and increased the number of older men she dated... After a while, she married a man two years older than her who worked for a top company, but her husband's sex was bland, and Anna, who had a strong sexual desire, could not resist it...