Keiko Uehara is a 33-year-old beautiful woman known for her pure, gentle demeanor and devotion to her husband. However, her daily life with her older husband is dull and unsatisfying, leaving her emotionally restless inside. In secret, she purchased a vibrator and copes with her loneliness through daily masturbation. She realizes she has masochistic tendencies and has long harbored a desire to be dominated and mistreated by someone. That desire has evolved into a craving for a partner who will push her body to its limits, finding ultimate satisfaction when she's tormented so intensely that she pleads, "I can't take it anymore!!"