Io, a 20-year-old from Miyazaki Prefecture, works part-time at a convenience store in the shopping district of Nerima Ward, Tokyo. With an ultra-sensitive G-cup bust, she's always conscious of her body both at work and in her private life. She works four to five days a week and lives near the shopping district. Standing 162cm tall, her weight is a secret, but her G-cup breasts have defined her figure since the end of middle school. For Io, her large breasts are a major attraction that draws male attention, yet she also feels embarrassment about being stared at. She doesn't usually wear tight clothes in daily life and feels shy about her own breasts. Currently single, she's had three boyfriends in the past and lost her virginity at 18 during her senior year of high school. To date, she's been involved with six people—more than just boyfriends. Her last sexual encounter was six months ago, and she's had a one-time fling with a friend. When she's in the mood, she's used to touching herself alone. She enjoys having her breasts touched but feels bashful about it. Being hugged from behind or engaging in affectionate moments turns her on. Though she claims to masturbate once a week, in reality it's more frequent, often triggered by memories of past sexual experiences. Her interest in adult videos stems from long-standing curiosity and a desire to experience it herself.