Young mothers, driven by the pressures of a "credential-obsessed society," pour obsessive passion into their children's exams, clinging desperately to their own bodies as if to protect them at all costs. Their hopes for their children's future manifest in extreme ways, turning the mother's body into a symbol of sacrifice. The fourth installment in the series captures the lewd acts of 23 mothers, fully exposing their passion and desire. The intense intersection of emotion and physicality delivers a shocking and deeply moving experience.