Yoko Omine, 53 years old. She has been living the life of a dual-income household for many years, and as her son has grown older, the responsibilities at home have lessened. However, she still feels unfulfilled and increasingly lonely. Her husband is busy with work, often staying late every night, while her son spends most of his time out with friends, coming home less and less. In this solitude, she copes with her loneliness by masturbating every night. Using toys daily to comfort herself, she tries to fill the emotional void within.