Mother Sayuri is watering the garden when she's suddenly overcome by an intense urge to urinate. She rushes toward the bathroom, but her son is using it, leaving her no choice but to begin relieving herself right in the yard. Once relieved, overwhelmed by a mix of euphoria and shame, she begins masturbating on the spot. The next day, she discovers her son had been watching her the whole time, and he demands, "Do it again outside like you did yesterday," forcing her into outdoor urination. Hesitant and conflicted, Sayuri is compelled to relieve herself outside once more. An ordinary moment spirals into an unexpected and twisted scenario, leading to a new, perverse development.