Set against the backdrop of the expanding sex industry in modern society, 18-year-old Mina is a private school girl from an affluent circle—her friends include daughters of corporate executives, and she spends her days surrounded by peers born into wealth. However, Mina's father is merely a mid-level manager at an ordinary company, unable to provide her with the generous allowance her friends enjoy. Desiring the same financial freedom, she turned to dating sites to earn extra money. By accompanying older men on dinner or karaoke dates lasting one to two hours, she could earn a month's worth of allowance in a single outing. Before long, she became deeply involved in this lifestyle.