Yoshie Ota, 53 years old, married for 28 years. While her husband and son are away at work, she spends her days at home with her beloved dog "Purin." After finishing her housework, she indulges in her daily habit of masturbation at the same time every day. The tablet her son bought to watch movies has become filled with lewd images she browses regularly. Despite being deeply immersed in her lustful, self-pleasuring routine, Yoshie recently began feeling bored with the monotony—until the term "butter dog" suddenly popped into her mind. Realizing this was dangerous, she ultimately decided against following through and withdrew her application.