Rei is a newly graduated caregiver. Her honest work has earned her the trust of the elderly man she is caring for, Kiyoshi. However, one day, Rei falls asleep while caring for him. When Kiyoshi asks her why, she reveals that she is working day and night to repay her fiance's debts. Instead of caring for Rei, Kiyoshi begins to sexually harass her! He makes her feed him with his mouth, entangles his filthy tongue, and when he cleans her, he makes her relentlessly take care of his penis. Kiyoshi calmly hands over the alimony to the distraught Rei. Worried about her future with her fiance, Rei makes an "implicit physical contract" after much conflict, crossing the line with the elderly man...