I'm Karin, a female college student living in Tokyo. My father is a doctor, my mother is a teacher, and I have an older brother. My parents have always favored my high-achieving brother. I was precocious from a young age and started masturbating early, but never felt attracted to boys my age. About half a year ago, I began posting self-taken photos on social media and started meeting various older men with particular interests. Through these encounters, I gradually discovered connections with partners who matched my own desires.