A beautiful young girl named Rin, who got involved in compensated dating to save up for overseas study expenses in a short time. Her first partner was a gentlemanly and kind middle-aged man. Trusting this man, she was introduced to his acquaintances and continued with compensated dating. Each meeting drew Rin deeper into perverse and intense sex with the old man. With his penis, she was trained into a greedy and lewd woman, both in mind and body.