A high school girl, bound and disciplined in a warehouse, is a naive girl who apprenticed to inherit her grandfather's restaurant. She gradually falls into depravity through what is ostensibly training but is actually a perverse hobby… (Usui Natsume GAJK-039)

Granddaughter Natsume is shocked to learn that her grandfather's long-running Western-style restaurant is about to close. Upon learning that the reason is his advanced age and lack of an heir, she volunteers, "I want to inherit the shop; please let me train." From then on, she spends her days after school at her grandfather's house learning to cook. Her grandfather watches his granddaughter's culinary skills improve. However, one day, seeing her bathing with her uniform soiled, a wicked thought begins to stir in his mind…