Tamaki is 30 years old, born in Nagasaki, and currently works at Kio○ku in Akabane. In her third year of high school, she was confessed to by a younger female classmate, which made her realize she was bisexual. Symbolizing that moment, when she entered junior college, she and her lover got matching genital tattoos together. He chose a butterfly design, while she chose a flower, representing their bond. However, their relationship ended when her partner got married. Because of the tattoos, her relationships with men never lasted, leaving her constantly frustrated and sexually unfulfilled. To cope, she became addicted to online shopping, eventually spending far more than her salary at Kio○ku could cover. Desperate, she decided to apply for a high-paying part-time job.