29-year-old single mother Rie has decided to take on the AV industry, leaving her 7-month-old child at daycare. Her motivation stems from over a year of postpartum sexual abstinence. To cope, she had been satisfying her desires three times a week by masturbating while fantasizing about handsome men—but her body remained unfulfilled, and her cravings only intensified. This is the debut documentary of "Lactation Cinderella," showcasing her exclusively until 4 PM, when she picks up her child from daycare, as she fully expresses her lactation. Witness the raw, passionate beginning of her new journey, filled with genuine shyness and burning desire.