After divorcing her husband, Shizuka found work at a local Chinese restaurant, where she diligently and sincerely devoted herself to her job. Respected and trusted by both the owner and customers, she maintained a composed exterior—but inside, she was consumed by overwhelming desire. In secret, during breaks, she indulged in masturbation using a vibrator. One day, a customer named Ishii noticed her and began pursuing her sexually. Though she verbally refused, her body instinctively responded. After that encounter, Shizuka's lust intensified, driving her to seek out new and deeper pleasures.