Karina, a born masochist who craves punishment, struggles daily with her inability to control her own desires. Driven by relentless, trembling urges, she deliberately sets herself up to fail, inviting harsh discipline each time. "I'm sorry... I'm so sorry," she pleads, bowing her head—each apology leaving a telltale stain on her panties she can't help nor hide. Blaming herself over and over, she waits in anticipation for her next mistake. In this endless cycle, her imperfect charm and innocent heart are laid bare.